@MGG and @fluff9947
So are you to generally take the 'yawning' behavior, as trying to get air, or seeking for food? (Or both??) This seems interesting to observe. Thanks for bringing up the yawning aspect. It seems worthwhile to note.
And when you say that 'Mum would normally help', did you mean the chicks mom? Or your mom? Do the mother hens start helping them when they get stuck hatching? Is that what this means, or has anyone see that? (for either chicks or ducklings)
If the mother hens themselves help the chicks when they get stuck then the idea of not helping them out to only have strong survivor chicks is false.