4 Month Old Baby: Development, Sleep, Feeding & Activities Guide

Development Milestones at 4 Months

By 4 months, most babies can: Rolls from tummy to back, reaches for and grabs objects, laughs out loud, bears weight on legs when held standing, brings hands to mouth, recognizes familiar faces.

Remember that developmental ranges are guides, not deadlines. Babies develop at their own pace, and there's a wide range of normal. The Wermom app tracks your baby's individual progress and highlights patterns unique to your child.

Sleep Schedule

At 4 months, most babies sleep approximately 12-16 hours (may start longer nighttime stretches). Every baby is different — some need more sleep, some less. Focus on consistent sleep cues and a calming bedtime routine rather than strict schedules.

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Feeding Guide

Typical feeding at this age: Every 3-4 hours (6-8 feeds/day), may be ready for solids around 4-6 months. Follow your baby's hunger and fullness cues. Growth spurts may temporarily increase feeding frequency — this is normal and usually settles within a few days.

Activities & Play Ideas

Great activities for a 4-month-old include: Rattles and crinkle toys, supported sitting practice, reading board books with high-contrast images, playing peek-a-boo, supervised water play, bicycle leg exercises.

Play is how babies learn about the world. Follow your baby's interests and keep activities age-appropriate and safe. Even simple interactions like talking, singing, and making eye contact are powerful developmental boosters.

When to Talk to Your Pediatrician

While every baby develops at their own pace, certain signs warrant a conversation with your pediatrician. At 4 months, contact your doctor if you notice: Not making eye contact, not responding to sounds, no head control, unable to bring objects to mouth, not showing interest in people.

Trust your parental instincts — if something feels off, it's always worth checking. Early intervention can make a significant difference.

Frequently Asked Questions

How much should a 4-month-old weigh?

At 4 months, typical weight ranges are 12-18 lbs / 5.5-8 kg. But healthy weight varies significantly based on genetics, feeding method, and birth weight. Your pediatrician tracks your baby's individual growth curve — consistent growth along their own percentile is more important than hitting a specific number.

How much sleep does a 4-month-old need?

Most 4-month-old babies need approximately 12-16 hours (may start longer nighttime stretches). Some babies naturally need slightly more or less. Focus on your baby's mood and behavior as indicators of adequate sleep rather than exact hours.

What activities are good for a 4-month-old?

Great activities include: Rattles and crinkle toys, supported sitting practice, and plenty of face-to-face interaction. The best activities are ones that follow your baby's current interests and abilities.