The short answer
There is no separate CDC milestone checklist for 3 months. Skills seen by 2 months are often becoming stronger: your baby may look at your face for longer, smile socially more often, make sounds back to you, watch you move and lift their head and chest more strongly during tummy time. Some 4-month skills may just be emerging, such as bringing hands to the mouth, reaching towards a toy, holding a toy placed in the hand or holding the head steady. Your baby does not need to do all of these at 3 months.
In this guide · 9 sections
Keep in mind
- Three months is a transition: 2-month skills are strengthening while some 4-month skills may just be emerging.
- Bringing hands to the mouth, holding a toy and steady head control are on the 4-month list and are not requirements at 3 months.
- Notice overall progress across communication, vision, movement and interaction rather than one skill in isolation.
Why is 3 months considered a transition?
The CDC has checklists for 2 and 4 months, but not a separate 3-month list. Because your baby is between the two checklists, it is more helpful to look at whether 2-month skills are becoming established and consider 4-month skills as upcoming.
Testing a 3-month-old against every item on the 4-month list may cause unnecessary worry. A skill that is still emerging is not, by itself, evidence of a delay.
What may change in communication and social connection?
Your baby may look at your face for longer, smile socially more often and answer your talking with sounds other than crying. They may more clearly calm to your voice or become active when they see you.
Do not expect uninterrupted eye contact. Looking away after interacting for a while is often a need for a rest; after a pause, your baby may turn back to you.
How do head control and movement progress?
During tummy time, your baby may lift their head higher and begin to prop up on their forearms. Head control develops between the brief lifts seen earlier and the steadier control expected closer to 4 months; continue supporting the neck when needed.
Your baby may move their arms and legs more smoothly and open their hands more often. Bringing hands to the mouth, batting at a toy or holding a toy placed in the hand may begin, but these are not required 3-month milestones.
What can you offer for play and learning?
Talk face-to-face, copy a sound your baby makes and wait for their turn. You can slowly move a simple toy from side to side to give them a chance to watch it.
Include short, supervised tummy-time sessions during the day. There is no need to make your baby perform a skill, move their arms for them or practise for long periods; short, enjoyable chances are enough.
Does premature birth change the expected timing?
For babies born more than 3 weeks early, corrected age can help make sense of development during the first 2 years. It is estimated by subtracting the number of weeks early from the baby’s chronological age.
Corrected age is not a label and does not replace routine check-ups. If your baby has an individual medical history, follow the advice of the professional who knows them.
What can you do today?
Have a short face-to-face chat with your baby; after they make a sound, pause for their turn.
When your baby is calm and awake, offer brief tummy time and notice how they lift their head and move both sides.
Do not treat the 4-month skills as a checklist to complete now; notice how the 2-month foundations are growing.
When to seek support
Some signs need emergency help; other concerns can be discussed with your child’s healthcare team.
- Very little interest in faces, no social smile or little response to sounds.
- Not watching a moving face or object, never lifting the head during tummy time, or using one side of the body much less than the other.
- Losing a skill your baby previously had, such as looking, smiling, making sounds or moving.
Sources used for this guide
- Centers for Disease Control and Prevention (CDC) — Milestones by 2 Months
- Centers for Disease Control and Prevention (CDC) — Milestones by 4 Months
- Centers for Disease Control and Prevention (CDC) — 4 Month Online Milestone Checklist
- American Academy of Pediatrics / HealthyChildren.org — Emotional & Social Development in Babies: Birth Through 3 Months
- American Academy of Pediatrics / HealthyChildren.org — Movement Milestones: Birth to 3 Months
- American Academy of Pediatrics / HealthyChildren.org — Warning Signs of Vision Problems in Infants & Children
English editorial review:
The English text and regional guidance have been checked editorially. This is not an individual clinical assessment.
Luluna provides general parenting information. It does not diagnose conditions or replace your child’s healthcare professional.
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