baby chicken not growing

[rsvp]

We brooded 3 Welsumer eggs, two hatched live - only one survived 24 hours. He/she is now three weeks old but doesn't really seem to have grown much - he/she is in with bantem chicks not much older but really much, much bigger - this one still looks like a five day old chick. Is eating/drinking/scratching well, occasionally has a bit of a problem with defecating, so is given a drop of diluted olive oil and has his/her bum bathed with warm water but is other wise is bright and well. Any ideas as to why he/she is so little? Many thanks

[wildwood]

One possibility.... the Welsummer pair was not in good condition when the eggs was fertilised. Or the pair was related, this often happens when folks don't swap breeding stock blood.

[EDDIE51]

Possibly it is just a lot smaller in proportion to the other 2 and you do not notice how it is growing.

[rsvp]

Thank you Wildwood and Eddie 51 - can't see anything wrong with the small one at all but it definitely looks like a week old chick instead of a three week old - anyway, will continue to give it lots of tlc and see what happens.