My nine-week old will only take a nap longer than 20 minutes in a carrier or in our arms. If we put her down drowsy, she snaps to attention after a minute or two and eventually starts wailing. If we put her down asleep, she only lasts about 20 minutes. Getting her down at night takes a lot of rocking, but she usually sleeps well once she's out. She gets up once or twice to nurse and goes right back to sleep.
Is she too young to be trying anything other than letting her sleep wherever and however she can? When should we start trying to help her sleep on her own?