Hello and welcome to HCM,
Red spots on the tongue can occur due to a number of causes.
However, appearance of these spots in 4 months old baby needs prompt attention.Erythroplakia
, aphthous ulcers
, nutritional deficiencies, etc can all cause red colored spots in the oral mucosa
Aphthous ulcers can occur due to fungal infections.
Various vitamins especially B-complex group, niacin can cause these spots.
Consult your pediatrician
for clinical examination, investigations and appropriate management.
Thanks and take care
Dr Shailja P Wahal