A.K.
I would recommend looking at the book TouchPoints by Barry Brazelton. Your local library probably has it. It will reassure you that this is probably a stage and will give you a preview of other behaviors you have to look forward to ;-)
My 15 months old went through a Mommy stage and a Daddy stage. She is now acting a bit more shy and bashful in public because she's realizing she's an individual and she can walk walk away, which can be scary. About 6 months ago she would just crawl away without looking back.
We also have a 4 year old neice and remember when she went through these stages and that has helped us recognize what is happening with out daughters development. Brazelton's book has also helped us recognize what is happening and made us more confident parents.