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At this age, your baby may:
raise his head high when lying on his stomach
raise his body on the hands when lying on his stomach
roll from his stomach to his back
play with his hands and hold a rattle
look at a mobile and move his hands
start social contact by smiling, cooing, laughing and squealing
cry when a parent moves out of sight
recognize when a bottle is being prepared and be able to wait for it for a short time.
Solid foods should start when your baby is 6 months old. If your baby doesn't seem satisfied with breast milk or formula, you may give him rice cereal. Feeding him rice cereal will not likely affect sleeping patterns.
Never prop up a bottle to feed your baby.
Do not give your baby fruit juice on a regular basis. You may give your baby diluted prune juice for constipation.
If you give your baby rice cereal, his stools may be less firm, occur less often, have a strong odor or become a different color.
About 80 percent of 4-month-old babies sleep at least five to six hours in a row at night. If your baby doesn't, put him to bed while awake. Give him the same safe toy or blanket. This is called a "transition object." Do not play with or have a lot of contact with your baby at nighttime.
Your baby does not need to be fed if he wakes up during the night.
Make sure your baby always rides in a car seat that is secured in the back seat, facing the rear window.
Do not let anyone smoke in your house or car at any time.
Never leave your baby alone, even for a few seconds. Your baby may be able to roll over. Take any safety precautions.
Keep baby powders, cleaners and small objects out of your baby's reach at all times.
Do not use infant walkers. They can cause serious accidents and serve no useful purpose. A better choice is an exersaucer.
What your baby needs
Give your baby toys he can shake or bang. A toy that makes noise as it's moved increases your baby's awareness. He will repeat that activity.
Sing rhythmic songs or nursery rhymes.
Your baby may drool a lot or put objects into his mouth. Make sure your baby is safe from small or sharp objects.