I wouldn’t recommend this mix, but my wife has had success with abandoned new-born kittens(in case you have an immediate concern):
1. Put in a small box with heating pad and covered with a towel.
2. Using a small bottle (from Wal-Mart), cut the opening larger with a knife.
3. She uses Kitten Milk Replacer mix (available from Tractor Supply, mail order or vet’s office)
4. They don’t eat much the first day or so, but after feeding, they need to be stimulated to go to the bathroom by rubbing their butts with a tissue
5. Segregate them by litters until healthy and eating food on their own
There. Everything, and more that you wanted to know. When we had dairy cattle, we kept colostrum from a healthy, older cow in the freezer for emergencies....
And if you didn’t really want to know all this, oh well....
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Both solutions works very well.
Just remember Heating lamps can overheat(cook) the infants and while they might not eat much they need to be feed about every 3-4 hours.
Store bought milk should not be used.