For me, call ducks are very tough to hatch. I always help them out, which some people think is wrong. But they always turn out fine. If you want to help them, it is up to you and nobody else.
To help a call duck hatch, it is good to wait for them to pip on their own. Since yours have pipped through the shell, it means they have fresh air, and should not die. Leave them for another day, which would be day 27. If they haven't done anything after a day, it is time to help. Just take a needle, and chip away a small part of the shell. If you see blood, stop and wait a few more hours.
Basically, you will chip away the top of the egg, just like the duckling would do. Once you've gotten the top off, look inside near the babie's belly. If you see yolk, you need to put the top of the shell back on and tape it. The baby will need to absorb the yolk before he is ready to get out of the egg.
Once the yolk is absorbed, the baby can come out. You can leave him there and let him wiggle his way out, or if he is weak, you can help pull him out. The egg membranes will dry out, so keep them wet with warm water.
Make sure you don't try helping until day 27-28, when the baby would naturally be hatching. Remember, if you see blood, stop and wait a few hours. If you see yolk inside the egg, tape the top back on and wait a few hours again.
I have gotten into many arguments over this subject. Many people (mostly large scale call breeders) do not approve of helping calls hatch. My opinion is that "I" may not have been perfect with my incubating skills, and it is not the duck's fault. If the duck needs help hatching, then I will help.
Every call duck I hatched, I helped out. They all have turned out fine, and nothing bad came of helping them. I do not hatch hundreds of eggs, like breeders do. So every egg is important to me.
I will note that I do not help any other type of bird hatch, whether it be chickens, pheasants, regular ducks, geese, etc. Just call ducks. For some reason, I guess since they are special and miniature, they have a rougher time with hatching. From experience, helping them hatch does not hurt them in the long run. Some may be weak for a day after, just because they did not use their muscles for hatching. But those ones catch up just fine to the rest of the stronger ones.
If you have any questions, please ask! I will try to post some duckling photos later tonight
