F.B.
We used Ferber, we used it early. DS's sleep schedule at 11 months was to go to bed at 8pm, and sleep till 7am. He would take a morning nap at around 10 for 45 minutes, and an afternoon nap around 2 for 1.5 hours to 3 hours. He was offered food 6x a day, and the ped had us limit the amount of formula he was on so he could get more solids in. At 11 months, he was eating probably 1.5 -2 jars or the equivalent at least 4x a day.
At around 15 months, he was moving towards one nap. At around 18 months, he was solidly into one nap, had after lunch for about 2 hours. He's now 29 months, and the sleep schedule remains unaltered. In bed at 8, rouses at 7 and an afternoon nap for about 2 hours. He still gets offered food 6x a day, which he sometimes accepts and sometimes refuses.
I mention Ferber because, it taught him to self soothe. DS would get into a light sleep cycle, or even rouse in the middle of the night. He would stand up, put his mobile on, lie down again, and go back to sleep.
If he woke distressed, or sick, we would attend to his needs. If he roused and made noise and wanted to play, we would go in, pat his back, say "its time to sleep" and walk out of the room. We did this at graduated intervals, and he came to learn that 1. we hadn't disappeared. 2. his needs could/ would be met. 3. waking up in the middle of the night did not constitute an emergency. 4. night time was not play time. 5. we would not be varying our response.
Good luck to you and yours,
F. B.