Since a baby’s skin is extremely sensitive and can get easily irritated or inflamed, it is specifically recommended to never use hair gel on infants. This is because an infant’s skin is very thin and can readily absorb anything that comes its way. Also, make sure that you always do an arm patch test prior to applying the gel on a baby’s scalp for a double-check. If the area becomes warm, red, or swollen, you know it's time to toss it in the bin; if not, you should be safe to proceed.