My 22 month old son use to love the bath, but now he doesn't it like it anymore. He will go in sometimes, but doesn't like to be wash or sometimes rinsed and definately doesn't like his hair rinsed either. It depends on the day if he likes some of the bath or none of it. He will go in the pool and in his little pool and lay on his belly and stick his face in a little. I anm not sure what might have scared him in the bath, but hoping it is just a faze.
I think this is a phase kids go through. I know my son did, and at 33 months he's still resistant to the idea of a bath (once we get him in, he loves it). I think part of it for him was getting water in his eyes when we rinsed his hair (which did happen sometimes when he didn't keep his head tipped up). Now I keep a dry washcloth nearby so he can cover or wipe his eyes when we're rinsing. Maybe try letting your son pick out a cool new bath toy, or let him help put the bubbles in, to make it fun again?
I think it's a phase, too. My son also went through it. For him it was out of fear. One time he was in the bath and I accidentally turned the shower head on. It freaked him out, and he was terrified of the tub for a while. I started letting him take whatever toys he wanted into the tub to make it fun.
They make special crayons for the bathtub that supposedly wash right off. I also know a lot of people have been letting their kids have glow baths, where they turn the lights off and throw in a bunch of glow sticks. Maybe try something awesomely distracting like that until he comes out of the phase. Good luck!
My third son just went through this and he is 21 months old....What I found to help was to go back and use his baby tub. It seemed that the bath tub alone was just too big to handle for some reason. Which is weird because he swims in a giant pool with water wings and jumps off the ladder and everything with no problem. As far as washing his hair they sell these visors you can put on them so the water dosent go in their eyes. My older sons loved those...good luck!
My daughter is 23 months old, and she started this phase around 20 months. She doesn't mind being IN the bath, but she doesn't like her hair rinsed at all. In fact, every time I pour the water over her head, she'll stand and lean over the side so that the water drips onto the floor (She probably continues doing that because she sees how aggravated that makes me lol) What helps with her is making it extra fun. I talk a lot and say things like "Ready?! here comes the water! WOOOO!!!!!" And try to get her cheering and looking up while I pour the water, so that none of it gets in her face. She's a total fish in the water, she jumps in and goes under and gets splashed, all with no problems at all. Something about the bathtub just isn't quite as fun as the pool, so the fun factor is gone so now they're just getting water in their face and that plain sucks! Try to make it more fun for him. Hand him the cup and let him dump it on his own head. Or another trick is to use toys. I have these plastic tub toys that you can fill with water. My daughter and I will fill them and dump them on her head. It'll be just a small stream of water instead of a big dump from a cup, and it becomes a game as to who can fill the toy and dump it on her head the quickest!
Thankfully, I haven't gone thru this with my twins. I'm the one who hates to give them baths. Well, "hated" is the right tense. It's much better now but I used to really just hate it. But now that they can be in the big bathtub, with toys and cups and that they understand they need to "look up" when I rinse their hair, it's a much smoother process. We use foam letters that stick to the wall when they are wet, and we spell their names and write simple words and have them name the letter so they can have their mind occupied when we clean them up. I also thought about the washable bath crayons but I'm concerned that they'll take this to mean they can write on any wall with any crayon at any time, so I'm staying away from those! LOL