need help with toddler sleep regression

andiandlou

DS 1 used to go to bed with no problem since about 9 months. We have a regular bedtime routine and used to be able to lay him in his crib fully awake and he would fall asleep within 15 minutes. At about 20 months he started climbing out of his crib so we transitioned him to a toddler bed. Now we have to lay with him in bed until he falls asleep and that can sometimes take 30 minutes to 1 hr. I noticed his sleep regression started about 1 month after we brought DS 2 home, and it has just gotten so bad. If I leave the room before he is completely asleep he starts balling and I have to repeat the process all over again.  I really don't have the time to lay there with him as I need to be checking on my littlest one periodically, especially because there are many nights I am on my own for bed time routine. Any help/recs will be greatly appreciated...also I would like to avoid CIO