Baby Development 4 Weeks 5 Days: What to Expect

Physical Development

At 4 weeks and 5 days old, your baby is continuing to grow and develop at a rapid pace. In terms of physical development, they may be able to lift their head briefly when placed on their tummy. Their eyesight is still developing, but they may be able to focus on objects that are 8 to 10 inches away.

Your baby’s reflexes are also improving at this stage. They may startle in response to loud noises or sudden movements, and they may even begin to grasp objects placed in their hands.

Cognitive Development

Although it may not be noticeable yet, your baby’s cognitive development is also progressing. They are learning to differentiate between familiar and unfamiliar faces and voices, and may respond to your voice with cooing sounds.

Your baby is also becoming more aware of their surroundings and may become more alert and interested in their environment. They may even begin to show more interest in toys and objects around them.

Social Development

While it may seem early, your baby is already starting to develop their social skills. They may smile in response to your smile and even imitate your facial expressions.

Your baby may also become more responsive to touch and begin to enjoy being held and cuddled. This early bonding is important for their overall emotional and social development.

Frequently Asked Questions

Q: What should my baby be eating at 4 weeks and 5 days old?

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At this age, your baby will be exclusively breastfed or formula-fed. They will likely consume 2 to 3 ounces of milk per feeding, with feedings occurring every 2 to 3 hours.

Q: When should my baby start to smile?

Your baby may start to smile in response to your smile or other familiar faces around 4 to 6 weeks old.

Q: When should I start tummy time with my baby?

Tummy time can begin as early as the first week of life, but should be supervised and limited to short periods of time at this age.

Q: How often should my baby be sleeping at 4 weeks and 5 days old?

Your baby will likely sleep for around 16 to 17 hours per day at this age, with periods of wakefulness lasting around 1 to 3 hours.

Q: When should I start introducing solid foods to my baby?

Solid foods should not be introduced until your baby is at least 6 months old and has shown signs of readiness, such as being able to sit up on their own and showing interest in food.


Watching your baby grow and develop is an exciting and rewarding experience. At 4 weeks and 5 days old, your baby is making great strides in physical, cognitive, and social development. Remember to provide plenty of love and support as your little one continues to grow and learn.

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