can i give 2 year old benadryl
1 AGE LIMITS. 2  For allergies, don't use under 1 year of age. ( 3 Reason: it causes most babies to be sleepy). 4  For colds, not advised at any age. ( 5 Reason: no proven benefits). 6  They should be not be given if under 4 years old. 7  If under 6 years, don't give products with more than one ingredient in them.