Am I wrong for feeling this way? Please help!

Me and my husband just had our baby boy two months ago. Usually when his parents come around and they suggest something my husband wants to do it, like give my baby tea for gas, which I don’t feel comfortable with giving him that right now. Don’t get me wrong I love my in-laws to death, but sometimes I feel like my husband wants me to do everything they taught him about how to take care of a baby. Like tonight, I gave my baby a bath, and was combing his hair to the side. My husband said to comb his hair forward because his parents told him it stimulates hair growth, since my baby kinda has no hair in the front lol, I told him I just wanted to comb it to the side and it became an argument. Am I wrong for feeling some stuff they tell him makes no sense?