I too have an 8 month old taking still taking 40 min. naps, been taking 40 min naps since 4 months ERRRRGGHGHGHGH. Some naps can go 2 hrs some 40 min.
Our baby BF's 3 x's a day at 7am, noon, 4pm, and gets EBM at 7:30...eats solids at BF, Noon, & Dinner.
He is in bed at 8pm, after nightly routine & sleeps thru till 6:30-7am.
We have the same wind-down routine for naps every day and it's always in the crib (not in car or stroller.) To figure out when to put him down for naps, I 1st try to see if it's been awake at least 2 1/2 to 3 hrs since awoke last, then I look for sleep window...eye rubbing, fussiness etc.
Developmentally, he's not crawling yet...just rocking on hands & knees.
I would LOVE LOVE LOVE it if someone could help!!! I know he needs more nap than 40 minutes. I've tried wake to sleep, PU/PD and nothing has worked. I've tried so hard to fix this and figure it out, but it has only stressed me out!!!