Yes, Mumry D3 Drops (cholecalciferol) are generally safe for a teething baby when used at the dose recommended by your paediatrician. Teething is a normal developmental process and does not affect calcium absorption, bone health, or the safety or need for vitamin D supplementation. Always give only the advised dose and avoid combining it with other vitamin D products unless directed, as excess intake can be harmful to the baby. If you are unsure about the need or dosage, please consult your doctor for personalised guidance.