Oo naman, it's actually okay to give Ceelin and Nutrilin kahit may ubo at sipon ang LO, a lot of mums I know swear by them pang-boost ng immune system, especially during rainy season when colds are everywhere! Ceelin Plus with zinc talaga ang go-to ng karamihan kasi it helps fight off the infection na nangyari na, and Nutrilin is solid for general nutrition. That said, both vitamins work better as support lang, hindi replacement sa actual treatment for the cough and sipon, so make sure your pedia gives the okay din, especially kung may other meds na prescribed na, and ask if mag-continue siya ng vitamins habang may sakit or adjust muna until he's better. Good luck sa LO mo!