stunted baby

I just recently joined this site as its helped me so much this week. So here it is, my Cockatiels had a clutch of eggs, we were actually told the male was a female... until he was seen on top of her... anyway the hen is pretty young and started rejecting her eggs, I ended up candling them as...

My babies are about 10 day old.One is bigger than the other(31 g.) and the small one (21 g.).I saw Sussane website and baby 9 days old has opened eyes and weight 56 g. Lol! What should i do? I bought eggs and will boiled them.I give them bread seed mix and carrots.Both babies are well fed.I can...