Hi, and welcome! Glad you found us
Potty training is somehting that will take time and you just have to stick to your normal schedule, whether its raining or not. I have pinestraw thats where my babies use the bathroom at when its raining. You could try using an umbrella.
Hair care: Brush his hair everyday, and at first I started washing mine with baby shampoo. Good luck. Hope my info was a help