Answering your queries above
1) I bathe two times a day (morning/before evening), both my kids ill use Cetaphil/Sebamed as they have sensitive skin esp to heat rash.
2) I will change outfit if it is full of puke, wipe with wet wipes / wet towel. Hence, advisable also to wear baby bib in which I use from 2 month onwards.
3) If minimal Ill use wet wipes, otherwise if alot and mutiple times of poop in a day then wash bum. Ill use Cetaphil product also.