feeding young bird

One of my pairs hatched their babies a couple of days ago. The first one tha thatched is pretty big compared to the other one. With my first couple of eggs they were growing every day but this one is falling behind. I am guessing he is about 3 days worth of grow from his older sibling and...

I've got an 8 day old (approximately) squab from the wildlife rehab in my living room. The little guy is eating well (feeding from a "bottle" with the majority of the latex nipple cut off) but he seems to always have air in his crop and I'm not comfortable feeding him too much as I don't want...