My DD went through the same thing at about that age, she was always a self settler before then. There are wonder weeks occuring at approx 8 weeks and 12 weeks of age and you will find that your bub's become more clingly around that time.

I only had about a week of DD wanting to be held and rocked to sleep and now she is a fabulous sleeper, who sleeps between 13-14 hours at night and is a happy self settler.