Breastfeeding app stress

I know it isn’t necessary to track feedings and dirty diapers, with my first baby she was underweight and I had her two weeks early so I was constantly tracking everything. Every two hours feedings and making sure she didn’t sleep too long past her feedings, only to be told at every appointment that she wasn’t eating enough or she wasn’t gaining weight. I gave birth to our second baby three weeks ago and everything is different, I feel kinda lost. He was born at 39 weeks, perfect weight and size.but for some reason I am obsessed with tracking his feedings and diaper changes, i feel Ike if I don’t track then I’ll some how let my baby go hungry or he will sleep too long without eating. And that the pedi will ask me about all this information and i wont have it.