My kitten is eating a lot

I've been away for a week on a work trip and I've come back to find my little kitten... with a right little potbelly! (My partner has clearly been looking after him well, from what I can see).

For a three-month-old kitten, he is getting Pro Plan kitten dry food ad lib, plus one pouch a day, which is about 100g (0.2 lbs) of wet food.

I think that’s a bit much, isn't it? To give you an idea, I bought a 400g (nearly 1 lb) bag of dry food two weeks ago and it's almost gone...

I've spoken to my partner and told him to cut back the portions... but he says our cat is hungry all the time; I just think he's struggling to self-regulate!

Thanks for your replies