If you have a baby that still takes a nap you will have to do a little adjusting to get him/her onto the new time schedule. Probably this morning he woke up an hour or so earlier due to the clocks moving back an hour.
So in order to accommodate, try to keep your little one up as close to the regular time for his nap and then put him to bed at his normal hour.
If your little one has given up his nap put him to bed as close to his normal time as you can and he will gradually adjust.
Good luck. Happy sleeping…