How does a baby develop in the first three months of life, week by week?
Applies to age: 0–3 months
In short
A child's development does not follow a strict pattern. A newborn checkup visit (porada patronażowa) with a primary care (POZ) doctor is planned in the 1st–4th week of life, and a medical examination with an assessment of physical development in the 2nd–6th month.
What is normal
Some claims: international norm
- Every child is different, and their development does not follow a strict pattern.
Source: Portal Pacjenta – show the quote
Verbatim quote from the source:
Polish original
Każde dziecko jest inne i jego rozwój nie przebiega ściśle według wzorca.
Portal Pacjenta · open the source · accessed: 2026-10-12 · license [1]
- If a child develops differently from their peers, there is no reason to panic.
Source: Portal Pacjenta – show the quote
Verbatim quote from the source:
Polish original
Jeśli Twoje dziecko rozwija się inaczej niż jego rówieśnicy, nie wpadaj w panikę.
Portal Pacjenta · open the source · accessed: 2026-10-12 · license [1]
- Newborns begin to recognize important sounds in their surroundings, for example the voice of their mother or main caregiver.
Source: NIDCD · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Newborns also begin to recognize important sounds in their environment, such as the voice of their mother or primary caretaker.
NIDCD · open the source · accessed: 2026-10-12 · license [2]
- In the checklist for hearing and communication development from birth to 3 months, one of the items is reacting to loud sounds.
Source: NIDCD · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Reacts to loud sounds
NIDCD · open the source · accessed: 2026-10-12 · license [2]
- Children differ in the pace of their speech and language development.
Source: NIDCD · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Children vary in their development of speech and language skills.
NIDCD · open the source · accessed: 2026-10-12 · license [2]
See a doctor
- Polish care pathway: the Ministry of Health (MZ) regulation on guaranteed services in primary care (POZ) (consolidated text, Journal of Laws (Dz.U.) 2023 item 1427, Annex 1 part III, item 1) provides in the 1st–4th week of life for a newborn checkup visit (porada patronażowa) with a primary care (POZ) doctor, including an examination that takes physical development into account. This is the timing of the visit, not an age range for skills.
Source: Akty prawne w Dzienniku Ustaw – show the quote
Verbatim quote from the source:
Polish original
Porada patronażowa lekarza podstawowej opieki zdrowotnej, obejmująca badanie podmiotowe i przedmiotowe, z uwzględnieniem rozwoju fizycznego
Akty prawne w Dzienniku Ustaw · open the source · accessed: 2026-10-12 · license [3]
- Polish care pathway: the Ministry of Health (MZ) regulation on guaranteed services in primary care (POZ) (consolidated text, Journal of Laws (Dz.U.) 2023 item 1427, Annex 1 part III, item 2) provides for the 2nd–6th month of life, at the times of the routine vaccinations, a medical examination that takes into account physical development, past illnesses and the prevention of rickets. This is the timing of the checkup, not an age range for skills.
Source: Akty prawne w Dzienniku Ustaw – show the quote
Verbatim quote from the source:
Polish original
Badanie lekarskie podmiotowe i przedmiotowe, z uwzględnieniem rozwoju fizycznego (pomiary: masy i długości ciała, obwodu głowy i klatki piersiowej), przebytych schorzeń oraz zapobiegania krzywicy.
Akty prawne w Dzienniku Ustaw · open the source · accessed: 2026-10-12 · license [3]
- If something about a child's development is worrying, it is worth consulting a specialist and making use of the advice of a midwife, a nurse or a pediatrician.
Source: Portal Pacjenta – show the quote
Verbatim quote from the source:
Polish original
Warto jednak skonsultować ze specjalistą to, co Cię zaniepokoiło i korzystać z rad położnej, pielęgniarki czy pediatry.
Portal Pacjenta · open the source · accessed: 2026-10-12 · license [1]
international norm “International norm” next to a section heading means its claims come from a non-Polish source, because no Polish source in our registry covers this topic. When this applies to only some of the claims, the foreign ones carry the same label next to their source.
Sources
- Portal Pacjenta (pacjent.gov.pl)License: CC BY 3.0 PL. Source: Portal Pacjenta (pacjent.gov.pl). Content summarized and translated by the editors; changed relative to the original.
- NIDCD – Speech and Language Developmental Milestones (USA)License: Domena publiczna (USA). Source: NIDCD – Speech and Language Developmental Milestones (USA).
- Akty prawne w Dzienniku Ustaw (ELI: eli.gov.pl, api.sejm.gov.pl)License: Akt normatywny, art. 4 pkt 1 ustawy o prawie autorskim (nie podlega ochronie). Source: Akty prawne w Dzienniku Ustaw (ELI: eli.gov.pl, api.sejm.gov.pl).