@chenml60 I fed expressed breast milk because I didn't want to breastfeed at all, and occasionally provided formula. At 10 months, my LO is now 50/50. I coslept and I don't think the method of feeding had anything to do with whether or not it was safe for my baby, and I felt some of the guidance was kind of wacky. If cosleeping is what works for you, than let it work for you! Others can mind their own business. I felt surprised by the amount of moms in my group that did it but wouldn't talk about it because of how frowned upon it was.
We coslept and transitioned slowly to the crib in her own room, the bassinet was a no-go for her. I started the transition around 2 weeks and she was fully in her room by about 8 weeks. I would try to do at least one nap a day in her crib ( the first, so if it was a bad nap her next one would make up for it). Usually I would put her down for bed and would try to get her to settle until 1am or so, then I would bring her to bed if she wouldn't settle or we couldn't keep going. Eventually she started settling faster and sleeping longer in her room. Now she sleeps through the night in her room. I miss our snuggles all night though. I tried bringing her to bed once a few weeks ago because I missed her, then again last week because she had a cold and needed the comfort, and she would happily sleep with me from 8(ish) until 1(ish), then she'd think it's play time and would wake up so I'd transfer back to her room. I know she is in a safe, comfortable place which is best for her but I miss those nights!
When cosleeping I put my baby in her pajamas with no sleep sack and found the body heat kept her warm. I would wear regular pajamas then kept a blanket below my waist, I don't move a lot in my sleep so I felt comfortable doing this and had I been an active sleeper I would not have. My baby's face was always about armpit level, I didn't think breast level made sense as she wasn't breastfeeding and armpit was where it was most comfortable for both of us.