By the time your baby reaches 4 months old, you’ll likely notice a huge leap in their development compared to those early newborn days. Their personality is starting to shine, they’re more interactive, and they may be hitting exciting new milestones. Here’s what to expect during this stage.
Physical Growth
- Weight & Length: On average, babies at 4 months may have doubled their birth weight. They’ll typically measure between 23–25 inches long and weigh 12–16 pounds, though every baby grows at their own pace.
- Head Control: Neck muscles are stronger now, and your baby can hold their head up steadily when supported in a sitting position.
Developmental Milestones
At this stage, many babies begin to:
- Roll Over: Some may roll from tummy to back, though rolling from back to tummy usually comes later.
- Push Up on Arms: Tummy time is paying off—your baby may be able to lift their chest with straight arms.
- Reach and Grab: Hand-eye coordination is improving. They may grab at toys, your hair, or even their feet.
- Bring Hands to Mouth: Sucking on fingers is a common self-soothing habit.
Social and Cognitive Skills
Your baby’s brain is developing rapidly:
- Big Smiles and Laughter: They’ll respond more to your expressions, voices, and silly faces with giggles.
- Recognizing Faces: They’re starting to know familiar people and may react with excitement when they see you.
- Increased Babbling: You might hear more vowel sounds like “ah” and “ooh” as they experiment with their voice.
Feeding at 4 Months
- Breastfed Babies: Usually nurse every 3–4 hours during the day.
- Formula-Fed Babies: Typically take 4–6 ounces per feeding every 3–4 hours.
- Solid Foods: Most pediatricians recommend waiting until around 6 months before starting solids, unless otherwise advised.
Sleep Patterns
- Many 4-month-olds sleep 12–15 hours in a 24-hour period, including naps.
- Night sleep may stretch longer (sometimes 6–8 hours at a time), but sleep regressions can still happen.
Tips for Parents
- Encourage Tummy Time: This strengthens core and arm muscles for rolling and crawling later.
- Talk and Sing: Language development starts with hearing you.
- Offer Age-Appropriate Toys: Soft rattles, textured toys, and unbreakable mirrors are great.
- Watch for Teething Signs: Some babies may start drooling or gnawing more, even if teeth won’t appear for months.
When to Call the Pediatrician
Reach out if your baby:
- Has trouble holding their head up.
- Doesn’t respond to sounds or your voice.
- Isn’t gaining weight steadily.
- Seems unusually stiff or floppy.
By 4 months, your baby is more alert, playful, and responsive. This stage is all about building strength, exploring new sounds, and bonding with you through smiles, laughter, and interaction. Enjoy these moments—they go by quickly!