Every diaper for 2 months was a poopy one for us, to the point that I was shocked when I only got a wet one. At 4 months usually get 1-3 dirty diapers a day.
Yes it is normal, the yellow colour is perfectly normal too. Considering babies feed on demand they will have lots of poop to make
Yeaah that sounds pretty normal. At that age they can sometimes poo after every feed. And runny and yellow is good and normal. Breastfed is often like this. It changes from about 5-6 weeks and can become less frequent. Breastfed can go up to a week with no poo without it being a concern.