I have a 3 year old (turned 3 a few days ago) and a 5 month old.
3 year old naps about 1-1.5 hrs in the day and sleeps 8.5 hours overnight (might wake 1 time depending).
5 month old sleeps about 3-4 hours in the day and about 10-11 interrupted hours overnight.
Both kids seem to sleep far less than friends with similar aged LOs and I’m so tired. The 3 year old used to be so much worse with a LOT more night waking!