Development up to one year: by month

Developmental milestones describe skills that most children—at least 75%—demonstrate by a given age. They help identify progress and promptly discuss issues with a pediatrician, but they are not tests or diagnoses. The ranges are broader than might appear from oral reports from loved ones. [1]

If a child is born prematurely, skills should be assessed using the corrected age, subtracting the missing values up to 40 weeks of gestation. This approach is accepted in pediatric practice and in early intervention materials. [2]

It's important to monitor not only the checkmarks on the list, but also the trajectory: is there more eye contact, sounds, attempts to roll over, or interest in objects? An increase in the variety and frequency of signals is a good sign. [3]

Some skills depend on the environment: if a baby is offered little tummy time, toys within arm's reach, or shared "chatting," then the skills of supporting themselves, rolling over, and cooing come later. Stimulation should be safe, with short repetitions, and with pleasure. [4]

Be aware of "red flags"—signs that indicate it's best to discuss observations sooner rather than wait for the next scheduled visit. A list of these for key age groups is provided below. [5]

Table 1. Key principles for monitoring development in the first year

Principle	What does this mean in practice?
Guidelines for the majority, not a “mandatory norm”	Compare a child first of all with himself
Correction for prematurity	Rate by adjusted age
The trajectory is important	Are there more looks, sounds, movements?
Environment matters	Tummy time, talking, toys - daily
Early consultation is a blessing	When in doubt, don't wait.

0-3 months: awakening feelings and first “dialogues”

First month. More wakefulness, improved hand-to-mouth coordination, gaze focusing at 20-30 cm, interest in faces and voices. Movements are still sweeping, and "newborn" reflexes are strong. This is the foundation for subsequent smiles and cooing. [6]

Second month. A social smile appears in response to an adult's speech and smile; the baby calms down in arms and when handled, and holds its head on its stomach for a while. The hands open more frequently. [7]

Third month. Raises head and chest better on stomach, leans on forearms, reaches for hanging toys, holds gaze longer on faces, and makes more "conversational" sounds. [8]

Why tummy time? Short, repeated tummy time sessions from the first days are the best, safest way to build neck and core strength and prepare for rolling, crawling, and sitting. Start with 3-5 minutes, 2-3 times a day, and by 7 weeks, increase to a total of 15-30 minutes. [9]

Play and contact. "Talk face to face," repeat sounds, show black-and-white high-contrast pictures, gently jingle a toy on the side—all of this helps the brain build connections and accelerates eye and neck motor skills. [10]

Table 2. Guidelines 0-3 months (briefly)

Age	Social	Speech and hearing	Cognitive	Movement
1 month	Looks at the face	Recognizes the voice	Follows briefly	Turns head on stomach
2 months	A smile in response	Cooing, gurgling	Looks you in the face	Holds head on stomach, opens palms
3 months	More "dialogue"	More sounds	Holds the gaze longer	Raises chest on stomach, reaches for toy

4-6 months: Rolling over, supporting yourself on your arms, first "chatter"

By 4 months, initiative increases: the child "catches" attention with their gaze, moves, and vocalizes to maintain contact. This is an important step toward shared play and turn-taking in "dialogue." [11]

Stable support appears on the forearms and palms, the baby rolls from back to side and stomach, and puts objects in his mouth, which is normal and beneficial for sensory experience. Objects of varying textures and safe sizes should be offered. [12]

By 6 months, most children confidently transfer objects from hand to hand, sit up with support, laugh out loud, and coo loudly with repeated syllables. This is the period of flourishing "speech games." [13]

Continue tummy time and active floor play: this accelerates the transition to rolling over to both sides, crawling on the tummy, and rocking on all fours. Keep sessions short but frequent. [14]

It's important to support the child's cues: if tired, pause; if interested, expand the play. This kind of "responsive care" fosters secure attachment and accelerates learning. [15]

Table 3. Guidelines 4-6 months

Age	Social	Speech	Cognitive	Movement
4 months	Seeks your gaze	More sounds for contact	Reaches for the object	Leans on forearms, holds head
5 months	Enjoys playing patty-cake	Syllable repetitions	Pulls into mouth for "examination"	Rolls over more often, reaches for a toy
6 months	Laughs, waiting for an answer	"Ba-ba", "ma-ma" as a sound	Moves an object	Sits with support, turns in both directions

7-9 months: Mobility and "I am an explorer"

At 7-8 months, many children sit more steadily, crawl on their bellies, "rock" on all fours, and attempt to crawl. A pincer grasp develops—first with a "rake," then with the thumb and index finger. [16]

By 9 months, the child sits confidently without support, quickly changes positions, reaches for a toy, "passes" it from hand to hand, and bangs objects together. Begins to understand object permanence: searching for a dropped toy. [17]

Socially, "wariness of strangers" appears, with increased protest when an adult leaves and joy upon their return. This is normal and reflects growing attachment. Support with short "bye-byes" and predictable rituals. [18]

Speech is more varied: many repeated syllables, a response to the name, gestures like "lift me up," the first conscious "give," "here" through gestures and intonation. Reading aloud and "commenting" on actions continues. [19]

Motor activity requires "obstacle courses" of pillows, tunnels, boxes, and safe low supports for pull-ups. This stimulates coordination and strength. [20]

Table 4. Guidelines 7-9 months

Age	Social	Speech	Cognitive	Movement
7 months	Wariness of strangers	More syllables	Playing peek-a-boo	Crawling on the stomach, landing more stable
8 months	Protest at parting	Hand gestures	Looking for a toy	Rocking on all fours
9 months	He's happy to "cuckoo"	"Ba-ba-ba", turns around by name	Looking for the fallen	Sits without support, carries objects

10-12 months: vertical supports, first steps and gestures

By 10-11 months, the child actively stands up, holding onto a support, walks sideways along the support, sits and stands up over the knee, and does many things with the index finger. Communication is rich in gestures, intonations, and "substitute words." [21]

By 12 months, most children play pat-a-cake, wave "bye-bye," bang objects together, point, understand simple gesture-guided instructions, and can take one or two steps with support or independently. It's important to remember that the first confident steps may come later. [22]

Eating is about learning textures: safe, supervised morsels, drinking from an open cup with a small amount of water, trying to find food independently with your fingers – all part of sensorimotor development. [23]

Reading pictures and “talking about pictures” is excellent for developing speech at the end of the first year: showing and naming objects, imitating gestures. [24]

Sleep is consolidated at night, but daytime dreams persist. Consistent bedtime rituals and a predictable routine facilitate regulation. [25]

Table 5. Guidelines 10-12 months

Age	Social	Speech	Cognitive	Movement
10 months	Playing by turns	Gestures are richer	Understands "give"	Stands at the support, walks at the support
11 months	Imitates actions	Syllabic "words"	Puts it in a container	Sits down and gets up through the knee
12 months	"Bye", "okay"	1-2 simple "words" or consistent gestures	Simple instructions	1-2 steps with support or on your own

Games and activities that really accelerate development

Daily "conversations" with facial expressions and pauses for your child's response are a powerful driver of social and speech skills. Repeat sounds, add simple words, sing short songs, read aloud, and "describe" a picture. [26]

Tummy time and floor play remain the foundation throughout the first year. Start with seconds and minutes and gradually increase, adapting to your child's needs. Vary the surfaces, heights of supports, and distances to toys. [27]

Games like peek-a-boo, pat-a-cake, and "My turn, your turn" train anticipation, turn-taking, attention, and self-regulation. This also helps you get into a routine more easily. [28]

Picture books and gestures are a "bridge" to words. It's helpful to translate a child's interest into words: "ball," "cat," "on." [29]

Support “responsive care”: read cues of tiredness and interest, respond quickly and to the point – this has been shown to improve development and even reduce the risk of depressive symptoms in parents. [30]

Table 6. Simple activities by age

Age	2-3 minutes	5-10 minutes
0-3 months	Face to face, "reciprocal smiles"	Short tummy time, contrasting images
4-6 months	Reach for the toy, "rolls"	Pillow tunnel, hand-to-hand transfer
7-9 months	"Peek-a-boo", "my move - your move"	Crawling to targets, large cubes into a container
10-12 months	Pointing gestures, requests for "give"	Pyramid, picture book, steps at the support

Sleep, nutrition, movement: daily guidelines for health

Movement. For children under 1 year of age, physical activity "several times a day" with a variety of body positions and tummy time, and avoiding long periods of confinement in car seats and bouncers, is recommended. [31]

Screen time. Not recommended for children under 2 years old, with the exception of video calls with loved ones. During the first year, it's best to replace screen time with shared play and books. [32]

Sleep. Consensus on duration: 4-12 months - 12-16 hours per day with daytime naps; consistent rituals and a predictable schedule facilitate sleep onset and nightly integration of cycles. [33]

Tummy time—the target minimum by 2 months is 15-30 minutes total per day, with gradual increases. This reduces the risk of plagiocephaly and strengthens muscles. [34]

Scheduled visits. Follow a schedule of checkups and screenings where development, nutrition, safety, and vaccinations are discussed, and standardized screening is scheduled if needed. [35]

Table 7. 24-hour benchmarks for the first year

Domain	Landmark
Movement	Several active wakefulness sessions daily, including tummy time
Fixation	Avoid prolonged fixation for more than 1 hour at a time
Screen	Not recommended for children under 2 years of age, except for video calls.
Dream	4-12 months: 12-16 hours per day with daytime naps
Rituals	Repeated calm rituals of going to bed, a predictable routine

Red Flags: When to Call Before a Scheduled Visit

At 2 months: no response to voices or loud sounds, does not hold head on tummy even briefly, does not look at face or smile in response. This is a reason to discuss with a doctor and, if necessary, perform a hearing and developmental screening. [36]

At 4-6 months: no rolling over or attempting to support themselves on their forearms while awake, hands are constantly clenched, no cooing or cooing is infrequent and monotonous. Also discuss how much time the child spends on their tummy. [37]

At 9 months: does not sit without support, does not respond to name, no "pick me up" gestures, no peek-a-boo play, no syllable variation. [38]

At 12 months: no pointing gesture or attempts at imitation, does not wave “bye”, does not try to stand with support, does not utter a single understandable “conditional” word or stable verbal imitation. [39]

At any age: loss of previously acquired skills, rare or glassy gaze, lack of interest in people, marked asymmetry of movements - a reason for early assessment and referral to early intervention specialists. [40]

Table 8. Red flags of the first year (summary)

Age	What's alarming
2 months	No smile, no face-to-face gaze, no brief rest of the head on the stomach
4-6 months	No coups, no humming, just constant clenched fists
9 months	Doesn't sit up, doesn't respond to name, no gestures
12 months	No pointing gesture, imitation, or attempts to stand at the support
Any	Loss of skills, lack of interest in people, marked asymmetry of movements

Brief conclusions

The first year isn't a race, but a series of "small steps," each of which can be supported by the environment: conversation, tummy time, floor play, books, and a predictable routine. Benchmarks help you see progress and ask for advice, while responsive care and safety are the foundation for healthy development. [41]