Hi Nic, my cat had her kittens 4 weeks ago and I got a worming paste in a syringe called panncur and I gave it to mum and kittens at 2 weeks and then again at 4 weeks and will do kittens again at 6 and 8 weeks. You will need tp prise the kittens mouths open and squeeze it right into the back of the throats. With mum I just put into her food like I normally do with the worming tablets! Hope this helps x