Oh wow thank you so much for being willing to help these babies.There are a few possible things going on.
Injury- spinal and limb injuries are not uncommon in young puppies and can happen from something as simple as being stepped on.
Low blood glucose levels. Puppies if they do not eat every few hours are unable to maintain the proper glucose levels. This can cause lethargy, weakness, twitching, seizures and even death. If he is weak due to low glucose levels then the pancake syrup should help. Give this every 10 minutes for the next 30 minutes.
Illness such as parvo or distemper.
A condition called swimmers puppy syndrome LINK
Mae sure you are feeding momma puppy food to help with milk production and you can try and see if these babies will eat some soft food, chicken baby food or hard food that has been softened with water or puppy formula which can be purchased at most pet stores.
If this is injury or disease related then it is going to take a hands on exam for a proper diagnosis.
Most puppies have worms but it should not keep him from being able to walk.
Try the syrup and try to get some food in him. If needed you can use the chicken baby food ( make sure there is no onions or garlic in the ingredients) and feed via syringe.
If he does not improve and seems to be declining I would get him in to a vet as soon as possible.
I hope this helps give you some direction. Please reply back if you have additional questions and I will be happy to continue.
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