hi,
wish i could help you out, but I am having the exact same problem. i see that my daughter (4.5 months) is getting sleepy, we have our wind down routine and she calms down, relaxes on my shoulder. I put her in her crib with her eyes still open, but drowsy. I try to avoid eye contact, have the room as dark as I can, but she just plays with my hand, smiles if i stand there and try to maintain shhh/pat. So for the last week I have put her in her crib and just left the room leaving her to babble. She seems semi-content with this. However, she never settles herself to sleep though and in about 20 minutes cries, so i pick her up...the only problem is by this time she is so overtired that she becomes hysterical, crying, rubbing her face in my shoulder and i have to stand there shhh/patting for anywhere between 20-40minutes...where she will usually fall asleep on my shoulder. So then i put her in her crib again...and she'll sleep for maybe another 15 minutes. Needless to say she has been very cranky the last couple of days. Normally she is a good sleeper at night...but this too is regressing. As far as i know she isn't gassy, teething......I have no ideas on how to help her fall asleep/stay asleep on her own during the day. The only way i can get her to nap is let her fall asleep on my shoulder and then put her in crib. Even then she only stays asleep for maybe 20minutes at a time.