My cat had kittens 3 weeks ago ... she had 5 but 2 died as they were born the 3 left are now 3 weeks and 5 days .... 2 are doing really well but the little boy seems to have trouble with his head ..almost as if its to heavy for him. he seems to be able to hold it still when he tries hard. He eats very well and can walk abou and play but he just wobbles his head alot..... any ideas? he is booked in at the vets for monday.