Here is an interesting article that may help some. I have used the glucose recipe listed in paragraph 10 on several occasions when I have had very small pups but the pups were able to latch on their own. Your pups could have something else going on. Sometimes if the pup has a very small hole in the back of it's mouth it is hard to see. Will the pup nurse from a bottle?
http://www.showpapillons.com/formula.htm
Have you tried putting a little corn syrup on the moms nipple? Are the moms nipples too large for the pup to latch on to?
I hope the little one starts to latch on and do well. Please keep us posted.