It's been almost 3 days that a stray we took in 4 weeks ago gave birth and 3 kittens have died already almost every 12 hours one dies also I have noticed that the mother has been blocking access to milk for a short while to these kittens also they tend to wonder around the nest not noing were there going to and last of all 3 are quite large and the 3 that died are half there size I don't want them all to die please help