Hi, anyone face flat head syndrome? Positional plagiocephaly?

I felt so useless as i didn't do well at taking care of my child. The mom guilt. We aware of it probably at 2nd month, but the doc mention he saw nothing. So end up at 3 month plus we decide to bring her to poly to get referal and seek hospital help. We think she is having flat head syndrome aka positional plagiocephaly. Anyone ever gone thru that? How was it like? I really felt guilty cause this is our 3rd baby. Most of the time i took care of her, so it can be my own fault. Cause husband juggling the other two.