My puppy is about 1 week old he hasent ate good since he was born he struggles to suck on his moms nipple I started to notice him staying the same size and super skinny compared to the other puppies so I started to feed him nestle nido kinder powder milk and he still stays the same size I would also force him to suck on it by holding her nipple & feeding him but it just didn't work. I need to know what to do before its to late.

You need to go to the vet.. although it may already be too late. Infant puppies don't fight very hard for life... they just end up dying.

What kind if milk were you feeding? Anything other than puppy formula, which is made specifically for puppies, is pretty much useless. Cow milk is used as a natural laxative in dogs... so if you are using a cow milk, you're doing more harm than good with this pup..

Call your Vet... today...