Four-month-olds are active, curious, and engaging. They reach for objects, roll from front to back, and babble expressively. The 4-month sleep regression is common as sleep cycles mature and lighter sleep becomes more frequent. This is also when many pediatricians begin discussing the introduction of solid foods at 6 months.
Contents
Here's what to expect at 4-month-old. Remember: every baby develops at their own pace — these are ranges, not strict deadlines.
Rolling Front to Back
Baby can roll from tummy to back, using weight shift and arm push to initiate the roll.
Intentional Grasping
Baby reaches for and grasps objects placed within reach, bringing them to their mouth.
Object Interest
Baby is fascinated by objects and will inspect them with eyes and hands before mouthing them.
Consonant Babbling
Baby begins producing consonant-vowel combinations such as 'ba', 'da', 'ga'.
Stranger Awareness Beginning
Baby may begin showing more caution with unfamiliar faces while still being generally social.
Feeding Distraction
Baby becomes easily distracted during feeds as they are more aware of their surroundings.
4-Month Sleep Regression
Sleep patterns change as baby's sleep cycles mature, often causing more frequent night wakings.
Mouthing Objects
Baby explores everything with their mouth, which is a primary sensory organ at this stage.
Showing Emotions Clearly
Baby's emotional expressions are now distinct and readable: clear joy, frustration, surprise, and interest.
What to feed:
How much: 5-6 oz per formula feeding; breastfed babies nurse 5-7 times per day
Schedule: Every 3-4 hours; may be dropping a nighttime feed
These age-appropriate activities support your baby's development at 4-month-old:
Texture Safari
Let baby touch and mouth a variety of baby-safe textured objects: soft, bumpy, smooth, crinkly.
Benefits: Develops tactile sensitivity, Encourages oral exploration, Builds curiosity
Rolling Practice
Guide baby gently through the rolling motion from tummy to back during play time.
Benefits: Develops motor skills, Builds body awareness, Encourages active movement
Baby Sit-Up
Hold baby's hands and gently pull them toward sitting from lying down. Support as needed.
Benefits: Strengthens core muscles, Prepares for independent sitting, Provides vestibular input
Bubbles
Blow gentle bubbles and let baby track and reach for them.
Benefits: Visual tracking, Encourages reaching, Provides delight and engagement
Month-by-month milestones, sleep tracking, feeding logs, and more. Science-backed, always free.
Track your baby's development →No credit card · No ads · Always free