At 8 months my both mine:
Up at 7 am
DD had to have no morning nap or she wouldn’t sleep at lunchtime
DS had 30 mins nap at around 9.30 am, either being pushed round in his buggy if we were out or if we were home, sleeping bag, cot, dark room, literally cuddle, said sleep time and put him down- and left him. If he cried for more than a minute or two I’d go back, re settle him but not pick him up.
Lunch was at 11.30 with water.
Lunchtime sleep 12.15-2.15 ish. Tried to always do at home. Again, sleeping bag, cot, dark room. Always did a story, then into sleeping bag, said sleep time and in the cot. DS was easy, DD was a harder, but I did persist.
Bedtime routine at that age was dinner at 5pm, then bath at 6pm, then into their room at 6.30, lights dimmed, bottle of formula (8oz) story, sleeping bag, cuddle, cot and left to self settle.
Both had dummies when they were newborn but I had to get rid of them before too long as they caused loads of sleep issues.
I did leave them to self settle, and it did take a lot of time and patience. I also could never do full on CC so would always go and resettle they quickly.
Both slept 7-7 by 8 months generally. However, they are now 9 and 5, and the oldest one is a terrible sleeper- she just doesn’t need sleep
so I’m not too smug about their baby sleep routine! Also my daughter slept absolutely terribly as a baby unless I had a strict routine- and even as a toddler she was very sleep sensitive- too much and she would be awake all night. 