postpartum weight loss

i’m a FTM. our rainbow baby was born 11 days ago and we are so in love (and so sleep deprived). i gained 35lbs during pregnancy. i’ve lost 25lbs in the past 11 days. i don’t know if this is normal and am scared my body is crashing. i don’t do anything special. i’m just constantly breastfeeding and pumping and not sleeping much. i haven’t left our house cuz i’m just so tired all the time. anyone else experiencing the same? it’s honestly a little scary and i don’t want to end up not being able to produce milk for my baby.