I think my baby had not enough milk for a long time

Hello parents,

I have a 9 month old, who eats meals with a strong appetite mostly. He's eating like 200 to 250g purées for lunch, 100g snack in the afternoon and 200g dinners in the evening. All the food is fairly balanced with proteins, diaries, carbs and vegetables.

He is not fond of milk anymore, he only takes the boob for comfort it seems. This has been going on for a while. I think he drinks only too few during the day. I feel like I must always "convince him" to drink. It needs to be in the dark, I sometimes need to "start" the succion with putting my pinkie in his mouth....

Have some parents had this issue?

Is it a really problem that my kid is not hungry for milk anymore (or at least not so much)?

Or is all well? He drinks water during meals (not a ton but some)

I don't really know what's wrong or right here...

Side info:

His BMI dropped a little at some point after he got a little sick and started crawling (a bit all at the same time)

He wakes up 3 times per nights and I usually nurse him then...