4 Months
Here's what's happening at this age - milestones, common concerns, nutrition, sleep, and vaccines.
Developmental Milestones
Based on the 4 Months checkpoint
Gross Motor
- Holds head steady without support - When you hold your baby upright, their head stays steady and does not wobble or flop.
- Pushes up on elbows during tummy time - When on their tummy, your baby props themselves up on their elbows and lifts their chest off the floor.
- May begin to roll from tummy to back - Your baby might surprise you by rolling from their tummy onto their back during tummy time.
Fine Motor
- Reaches for toys with one hand - Your baby extends their arm to reach for a toy they want, even if they cannot always grab it yet.
- Can hold a toy and shake it - Your baby can wrap their fingers around a rattle or small toy and hold onto it.
- Brings hands to mouth - Your baby reliably brings their hands - and everything they hold - to their mouth.
Language
- Babbles with expression - copies sounds heard - Your baby experiments with sounds, stringing together vowels and sometimes consonant-like sounds like "ba" or "ga."
- Tries to copy sounds you make - When you make a sound, your baby tries to repeat it back to you.
- Cries in different ways for hunger, pain, and tiredness - Your baby's cries now clearly differ depending on whether they are hungry, in pain, or tired.
Social & Emotional
- Smiles spontaneously, especially at people - Your baby smiles freely and often - especially when they see familiar faces.
- Copies some facial expressions (smiling, frowning) - Your baby mirrors some of the facial expressions they see - if you smile, they smile; if you stick out your tongue, they may try to copy it.
- Enjoys playing with people and may cry when playing stops - Your baby clearly enjoys interactive play and may fuss or cry when you stop playing with them.
Cognitive
- Uses eyes and hands together to reach for a toy - Your baby sees a toy, reaches for it, and can often grab it - their eyes and hands are working together.
- Follows moving things with eyes smoothly - Your baby can smoothly track a moving toy or person with their eyes from side to side.
- Recognizes familiar people and objects at a distance - Your baby can recognize you and other familiar people from across the room.
Red Flags to Watch For
- !Does not watch things as they move
- !Does not smile at people
- !Cannot hold head steady
Common Concerns at This Age
Things parents often wonder about around 4 months
My Baby's Belly Looks Swollen
A rounded, slightly protruding belly is completely normal in babies and toddlers due to immature abdominal muscles and t...
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal deli...
When to Introduce Allergens to Baby
Current guidelines recommend introducing common allergens (peanut, egg, cow's milk products, tree nuts, wheat, soy, fish...
I'm Worried About Lazy Eye (Amblyopia)
Amblyopia (lazy eye) is the most common cause of vision loss in children, affecting about 2-3% of kids. It occurs when o...
My Baby Has an Anal Fissure (Blood When Pooping)
A small streak of bright red blood on the surface of your baby's stool or on the diaper is most commonly caused by an an...
Anaphylaxis Signs in Baby
Anaphylaxis is a severe, potentially life-threatening allergic reaction that affects multiple body systems. In babies, i...
My Baby Has Unequal Pupils
Slight differences in pupil size (anisocoria) can be normal and affect up to 20% of people, including babies. However, i...
My Baby Stops Breathing Briefly (Apnea)
Brief pauses in breathing lasting under 10 seconds are very common in newborns and are called periodic breathing. This i...
Food Readiness
Some babies show signs of readiness around 4-6 months - talk to your pediatrician
Peanut Butter
Thinned smooth peanut butter (mixed with breast milk/formula/water)
Allergen: peanutSleep Needs
4-6 months
12-15 hours
Total sleep per day
10-11 hours (0-2 feeds)
Nighttime sleep
3-4 naps
Naps
Tips for this age
- Sleep training is an option if you choose (no method is 'right' - find what works)
- Stop swaddling once baby starts rolling
- Blackout curtains and white noise can help significantly
- Aim for an early bedtime (6:30-7:30 PM) - sounds early, but it helps
Vaccines
Vaccines due around 4 months
Rotavirus
Protects against rotavirus, a common cause of severe diarrhea in babies.
Diphtheria, Tetanus, Pertussis
Protects against three serious diseases: diphtheria, tetanus, and whooping cough.
Haemophilus influenzae type b
Protects against Hib disease, which can cause meningitis and other severe infections.
Pneumococcal
Protects against pneumococcal disease, which can cause ear infections, pneumonia, and meningitis.
Polio
Protects against poliovirus.
Every baby develops at their own pace. The ranges here are based on typical development from the CDC, AAP, and WHO. If something feels off or you have questions, trust your instincts and talk to your pediatrician. You know your baby best.