The fourth month is one of the more enjoyable and easier to manage times in the first year of a baby's life. Being with babies at this age is more fun because of their responses. They delight at being held, bounced, cuddled, sat up, and played with. Toys mentally stimulate a baby's learning processes. Three or four naps in 24 hours become routine. A new interest with food begins with the gradual introduction of semi-liquid, mushy foods. Thriving babies show a steady weight gain of about 6 to 8 ounces per week. Hiccups, drooling, gagging, and sneezing emerge. New growth and development milestones occur by the end of 4 months.

The 4-month-old's motor skills include:
* Turning head in all directions when sitting or lying down.
* Supporting own weight when held upright with feet against a flat surface.
* Sitting supported with head steady for 10 to 15 minutes.
* Trunk control, turning over, and head control mature.

The 4-month-old's language skills include:
* Maintaining a strong, steady cry.
* Imitating a few sounds.
* Smiling, squealing, and cooing when spoken to.

The 4-month-old's mental abilities include:
* Seeing in color and awareness of depth and distances.
* Discriminating between people and between objects.

The 4-month-old's social traits include:
* Enjoying play, games, and socializing.
* Laughing.
* Friendly with adults, even strangers.
* Wailing if play is stopped.
* Splashing, kicking, and lifting head when taking baths.

Four month old babies will cry when they are lonely, want attention, or are ready for play. Do not ignore these cries. Responding will keep them from feeling lonely and help them become emotionally healthy. Attending to their needs and giving love will calm them. Avoid playing with or stimulating the baby at night. If he wakes, comfort him in the crib by rubbing back, gently talking and expressing your love. Have baby sleep on her back or side unless you have been told otherwise by your doctor. Be sure your baby receives its second DTP, polio, Hepatitis B, and HiB immunizations now.

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