Husbands hygiene

He used to shower, brush his teeth do his hair and take care of himself every day. We recently had our second child and I noticed it started to go down hill he works 6 days a week and doesn't really take care of the children I do so it's not a case of "he doesn't have the time" I shower and brush my teeth every day along with makeup and taking care of two kids under two!

he has gone without a shower for a month! I'm not exaggerating either, other then going a month he usually goes 2-3 weeks without showering OR brushing his teeth it's gotten so bad that today I walked into a room that he was previously in to collect some laundry and his stench filled the room! It was so bad I covered my nose and I refuse to have sex with him because his smell is very off putting! I've tried talking to him about it and he takes it as a joke! I've said to him "honey go take a shower and relax it's been a while" his response was "can't be bothered Bub *laughs* it's been like a month"

I don't know how else to approach this! I've tried being nice about it but now it's getting a bit much!