DD only really does short naps in the daytime - it can be anywhere from 10 mins to 1hr but most average about 30-40 minutes. She can't fall asleep alone so is always held to sleep, with rocking and/or patting and/or walking around until she's very drowsy then just held til she drops off. We tend to wait til we think she's out for the count until we put her down, and she has a dummy, but the last week or so probably 70% of the time she is waking as soon as we put her down. She would stay asleep longer if we held her but especially if I'm on my own in the daytime, I can't keep a hold of her all the time or I'd never eat or get a chance to shower or make up her bottles or anything! Sometimes you can resettle her with her dummy and patting once she's down but about 70% of the time she gets wide awake seemingly instantly and starts smiling and kicking about and so you have to pick her up and start all over again. It also always takes between 20 minutes and 1hr to get her to sleep in the first place, from when I see tired cues, and the 45min+ sessions of trying to get her to fall asleep are becoming more and more frequent.
I know the short naps at this age is developmental and normal but if I can't put her down at all for them this is becoming a problem 
. I don't know how to teach her to fall asleep elsewhere, I've tried loads of times and she will sleep on the move in the carseat or pram or carrier but not if stationary in Bednest/pram carrycot/anywhere, she just fights and fights it and gets more and more ratty until she starts to properly cry and cry and then I won't leave her distressed but it just takes even longer to get her to sleep if she gets in a state. Any tips? I have tried waiting longer whilst she is asleep on me btw, sometimes I can hold her for like 20 minutes but as soon as I put her down she still wakes up!
She is a good sleeper on a night, it's just the daytime napping that is tough.