Well my baby didnt like wet grass at all. In fact when he was around 6 months he would refuse to go on the wet grass and thats the only place he would poop lol He doesnt like to be in the rain either but doesnt mind snow. I think he got much better as he got older. Now he will show me that he doesnt like the wet grass but he would go. So I guess just have some patience they overgrow those things
