What do I do?

Hi ladies,

The other night my husband and I went on our first date night while my MIL put our son to bed. My son did great and went down with no fuss. She gave him a 6oz bottle of my milk and drank it fast and was very happy. He slept from 7:30-7:30.

My question has a couple layers to it. I usually nurse my son to bed, we don't do a bottle other than that night my MIl watched him. He woke up with a full diaper and slept 12 hours.

My son usually sleeps from 7:30-7 if I nurse to bed BUT wakes up with a dry diaper.

I'm concerned now as I think of how full his diaper was after the bottle before bed as opposed to me nursing him to bed.

I'm wondering if I should give him a bottle before bed more often? I'm just worried because my MIL keeps saying he needs to eat more but I feed him on demand so usually every 1.5 hours and sleeps through the night so I'm assuming he's getting enough calories. She said she can "see his ribs and the boy needs more food" which kind of upset me and made me feel like I wasn't giving my son enough.

The full diaper vs dry diaper worried me though but maybe I'm overthinking this.

What do you ladies think?