My son is 9 weeks old and still has to be swaddled in order to go to sleep. On some occasions when he is in a deep sleep I can unwrap him and he will stay a sleep. He still sleeps around 14-16 hours in a 24 hour period and I don't want him to not have good arm control. Is it ok that he is still having to be swaddled? How can I encourage him to sleep without it?