maybe you baby is growing well or learning new skill sets sometime in certain weeks or months your baby growing thru growth sprout , some will take increasing much milk some may take less and tends to sleep more, as long as there is intake of milk and output of urine don't worry too much if your mum gut tell you you need to go PD, then go for it always trust your gut, maybe it's nothing but sometimes you just want a peace of your mind . cheers
Ira Hamen