Do you have supplemental lighting to give them at least 14 hours of light a day? I give mine a break this time of year and don't turn on lights until December, so egg production is way, way down. Almost none of my spring hatched pullets are laying yet, and as I alluded to, I'm fine with that, but I understand that others want eggs sooner. I have several pens of 20 - 30 pullets that are point of lay, and I get about an egg a day (from all of them combined).
Get lights on them early in the morning if you want them to lay all year. By January, my lights are coming on at 3 AM and off at 8AM.