My kids were born in 05 and 08. I was told by 2 different doctors to put them in the car seat because they were having trouble breathing/congested at night. My son also has reflux and now that he is older we have pillows propped under one end of his crib to keep him more upright. I didn't feel comfortable keeping them in the seats so much. My poor son had to sleep in his car seat at daycare also because of the reflux problem, so I asked that he only be in it while sleeping and not when he was awake. We had to do a lot of holding to keep him upright at home so that he wasn't in the seat all the time.