Bath time

Is anyone’s S/O afraid of bathing the baby? My son is 5.5 months and my fiancé is afraid of bathing him, so bath time always falls on me which is fine but sometimes it’d be nice to hear “don’t worry I got it” or “he’s already bathed”. I’ve tried offering him to watch and help me to get used to it but he doesn’t seem to want to. It’s starting to get annoying honestly. Anyone else with this issue??

He’s great in every other aspect with helping, but at some point enough is enough and I feel he should take on some bath time too. Any suggestions or advice?