Could there be an underlying medical issue causing my active 15-month-old son's slow weight gain, even though he eats and sleeps well, has met all his developmental milestones, has a normal heart ultrasound, and recently stopped taking vitamin D, Calcimax, and iron?
Having a normal heart ultrasound is also highly reassuring. At this age, toddlers become extremely active, which naturally burns a lot of calories and can slow down weight gain. Since he recently stopped taking vitamin D, Calcimax, and iron, his body may just be settling into its natural growth curve. Sometimes, minor nutrient absorption variations or high metabolism are at play, but his overall energy and milestones are the best indicators of his health. I recommend sharing his growth chart with his pediatrician to comfortably monitor his progress.