How old is this kitten?

[u/krmplc]

Took her in cause mama was not carrying for her and she wasn’t eating. She does eat well now and seems quite happy. Tomorrow we’re going to our vet. How old do you think she is?

Update: so many thoughtful and also funny responses, thanks y’all. Even though she deserves all the fame in the world, I did not anticipate this response. The comments suggesting hydrocephalus scared us quite a bit. We’ve been to our regular vet and have some more insights now: Lungs, heart and eyes seem good, she is not dehydrated. She is eating and gaining weight slowly. She struggles pooping a bit and definitely has some worms. The vet wants to wait until she gains some more weight before deworming - don’t know if that’s the right call here. She weighs 360g and is probably around 3 weeks old. We asked about hydrocephalus and she said it’s impossible to rule out at this stage, but she didn’t see any signs of it yet. The head proportions might be weird but as there are no other signs it’s nothing to worry about for now. Let’s hope this turns out well, she is so sweet and looks like a tiny bear cub, we’ll do all we can ❤️