Thanks nicoleb2 for your post. Both my girls now almost 11 and 15 were born 7/8 weeks premature. They didn't know why this happened. I did miss holding them right after birth, but instead got to hold them a fews hours later and I did the Kangaroo care. Although I went home without them, I spent all day at the Neonatal Intensive Care unit. I held them every chance I got and breast fed them - at 1st they couldn't latch on but eventually they got it. I now have 2 very affectionate and bonded young ladies. I made a point of establishing that physical bond and even today work on making a valuable connection with my girls. Several times a day they get giant hugs.
If the infant doesn't have this opportunity to bond, he/she can form attachment problems but there's also other factors as well. There are some disorders which cause attachment issues even with the best parent. In addition twins often bond with their twin sibling more so than the parent.
Funny thing is, my dog is exactly like my girls lol. We hugged / kissed her as a puppy and trained her with positive discipline so we all understand /relate to each other well. She's also super affectionate.