Mommies, hello, I have a question for you, how do your babies go potty…

Mommies, hello, I have a question for you, how do your babies go potty? We've had diarrhea since birth, every few hours when he was born, up to 7-8 times. Now at 4 months old, 1-2 times a day, but it's like water, absorbs into diapers, weight is gaining well, he was born 3.700 now 8 kg I started worrying, is this normal? Do we need to see a doctor? But we have such a doctor? and we need to go to a private one in the city, but for now, it's too hot to take the kids out.