Going back to the beginning, how did you get the baby fish in the net? Did you catch the female and put her in the net, where she gave birth? Or did you catch the fry out of the tank and put them in the net?
If you caught the fry out of the tank with a normal fish net then you probably damaged them when you caught them. You should only scoop them out with a cup or small container and gently pour them into the breeding net.
If you caught the female and put her into the net when she was in labour or within a day of her giving birth, then you could have damaged her and the babies. Mollies are generally a bit big to be put into a breeding net so you would be better off leaving the adult females to give birth in the tank, then scoop the fry out.
If your mollies and guppies are only giving birth to 10 young at a time then they aren't being fed properly, or are suffering some major health issues. Healthy adult female mollies can produce over 100 young in a batch and most should produce 50+.
How often do you feed them and what do you feed them?
How long did you have the females for before they gave birth? If you only had the females for a few days then they could have been stressed from the move and gave birth prematurely, and this is why the fry are dieing.
The fish in the pic could be skinnier than she was because she gave birth.
Most livebearers, (mollies, guppies, swordtails, platies, etc) carry internal parasites like worms. It is always a good idea to treat any new fish before adding them to the tank. If you don't have a quarantine tank then treat the display tank after you add them. If you don't treat the fish for worms then eventually the worms drink so much blood the fish die. Also the worms can cause internal bacterial infections and the scar tissue they leave on the intestinal wall can prevent food being absorbed by the fish. Then the fish suffers from malnutrition as well as losing all its blood to the worms.
If your fish have worms then you need to feed them more until they are treated. The more food the fish get, the more chance of them living a bit longer. However, don't overfeed them as any uneaten food will rot and cause water quality issues.
As Wilder has suggested, ring your local vet (the place where you take a sick cat or dog) and ask them if you can get some Levamisole to treat intestinal worms in fish. If they say yes then hop on a bike or catch a bus to the vet and get some. If you can't get there then ask if you can send them a money order from your post office. Then when they receive the money order they can send you the medication. Alternatively you might be able to find a supplier online who sells it but that will depend on the laws in your country.