thoughts on swings?

Sarah
So my LO is a month old and he's a pretty terrible daytime sleeper. He rarely sleeps for longer than 30 minutes at a time unless I'm wearing him in a wrap then he might sleep for and hour. He does fall asleep in the car though so I'm thinking of getting a swing. Will this cause problems though and make him unable to sleep without the motion? He does sleep a little better at night and I definitely don't want to mess that up! And by better I mean 1-2.5 hours at a time.