“If the growth pattern changes, that usually refers to either more rapid growth or slower growth than expected,” Scott says, adding, “At specific ages, a baby’s growth pattern will normally change.” Most notably, baby’s growth will slow, which is evidenced in the decreasing slope of the baby growth curve. For example, baby will gain weight quickly in their first four months and then start to slow down. “There is a gradual slowing to the age of three, then growth in height and weight gain is more consistent until the pubertal years,” Scott says.