Hello doctor, my pediatrician suggest vitamin d3 60000 iu oral solution (5 ml each) in one go weekly dose for 2 weeks.(total 2 doses). My 18 months old baby is healthy and active. But confusion is: some research says: 1 to 3 years: 15 mcg (600 international units) daily upper limit: 63 mcg (2500 international units) is it okay to give 60000 iu in one go? As I think it would be to much for 18 months old and my second query is when should I give next dose? Thanks. Age: 18 months, height :3' 0" (91.44 cm), weight :28 lbs (12.7 kg)