15 month old falling asleep in stroller

[susanasou]

DS is now 15 month old, he has been falling asleep in his stroller since 5 months old. We always move him to the crib once he falls asleep at night but we have been letting him sleep in the stroller for his two naps. He doesn't need motion, once he offer him his bottle and placed in the stroller at full recline, he will fall asleep on his own. He will not fall asleep in the crib on his own though. We would like him to sleep in the crib only. Any suggestions?