My goldfishes had 4 fry who recently turned 1 week old on 7/17! When I was doing a water change I found 2 more fry (who are at the early stages of clinging to walls). I recently found out about the 'If the fry are bigger than the old ones' mouths then they can live' thing but I added some photos so I can get a second opinion (it's hard for me to tell if they're bigger than their mouths). The first 3 are of my week old fry, the last one is of my newly hatched fry.
P.S I was thinking of feeding the new fry more often than my older ones (once they start free-swimming of course) so they can catch up in size, then I will put them together. Thoughts?