should I be getting more eggs?

[sydney13]

I have 7, 8 month old chickens, 4 of which are laying. My barred rock, jersey giant, buff orpington and silkie (silkie is 2 years old) are laying, the easter egger, brahma and cochin I am still waiting for. Ive been getting between 1 - 3 eggs a day, normally two. Is this a little low for 4 producing hens? They started to lay around 5 - 6 months old and were laying almost an egg a day each but now its gone done.
Also should my other hens have started laying by now (8 months old)? I am almost sure they do not have nest in the yard because everything is covered with snow.
I was expecting my easter egger to lay first because her comb got bright red early on but still no eggs from her. A few months ago she had a problem with her toe nails falling out, which is fine now but Im wondering if it could have delayed her laying?

 

[blueseal]

mine slowed down this fall around october and are just starting to pick back up in the last week. i have 20 layers ranging from 6 months to 21 months old i was getting 5-6 eggs a day until today when i got 10. i dont use artifical light just natural. i have barred rocks , white leghorns rhode island reds, cinnamon queens, deleware, and black sex links,

 

[Ariel301]

It could be the weather, or a health problem. Or...who knows? I've got 20-ish 11 month old pullets and only one of them is laying, and she's only laying about three eggs a week. She just started two weeks ago. No one else has started. Lots of people are having trouble this year with birds not starting to lay at the proper age...