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.