How will you explain to your mother in law that you're not a believer of the saying "babies should not take a bath on Tuesdays and Fridays"? I told her politely that babies needs to take a bath everyday,but she insist that its bad luck. She even got mad at me.

Kids, even babies as young as newborn should take a bath daily. Especially during summer months. My little girl, now 20 month old, was advised by her pedia to take a bath twice as even as early as 7 months. Kids even babies also suffer from hot weather, it is best that they take a bath daily to freshen up and balance their body temperature. As long as we are quick to dry them up and dress them. There should be no fear of getting sick. I think, as long as the baby is perfectly healthy your mother in law would be at peace with daily bath. To which my answer to your questions is -- when the in laws are in doubt, all we can do is proceed with what we think works best for our kid. Show them that the result is a happier and healthier little person. We wouldnt want to harm our kids. No parent does.