Osteomed Child & Toddler Vitamin D3 Drops can have side effects although these don't affect everyone and are usually very mild. These can include nausea, loss of appetite, constipation, stomach ache, thirst, weakness, drowsiness, skin rash and itching. If side effects were noticed, associated with the use of Osteomed Child & Toddler Vitamin D3 Drops tell the doctor or pharmacist.