My 2 yo gets maybe a bath a week. When i deem him stinky or his hair is getting encrusted (he runs his hands through it when they're covered in food). His hair only gets washed when it's getting crusty, and for us "washed" means water and BS. I do not use soap on him, and never have. BS or plain water has been plenty.Â
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That being said, for myself, I'd love a shower every day, but reality is that it doesn't happen. But I go about a week (7-9 days) between hair washings (also with BS). When I used to use shampoo, I had to wash my hair every other day or it would get nasty, but now once a week is plenty. Your body really does start depending on that stuff.
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As for the question of sensitive crotches, both DH and I have similar issues. If I sleep in underwear, I will start getting a rash in the fold between leg and crotch. So I tend to sleep without, whether I have pjs on or not. If DH doesn't change his underwear at least once a day (I mean, wearing 1 pair in the morning and a different pair in the evening), he'll start getting a rash. So he changes his clothes completely when he gets home from work and doesn't sleep in underwear either.Â
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As for smell - so much of it is dependent on personal chemistry. Diet, health, exercise, genetics all effect our personal smell. As do things like living space (living with a smoker, in a house with poor kitchen ventilation, if you regularly use a fireplace, etc.), and laundry habits (frequency, type of detergent, washing temperature, even types of fiber in the clothes). Daily showering does not address all of those things. I've known plenty of people who showered regularly who I don't want to stand too near because i do have a sensitive nose. Yet my toddler who is still wearing diapers and gets a weekly bath when he starts smelling too ripe (usually ammonia) doesn't bother me most of the time.Â