Princess is 15 months old, I got her at 9 1/2 weeks & she is glued to me as well. She'll go on the patio alone (with me at the door), or with my daughter outside, etc. but as far as me doing anything alone..it's impossible!
Sometimes I'll feel so guilty because she'll be sleeping so comfy, cozy & if I have to get up she'll be right there with me, stretching along the way!
I just think that's how Yorkie's are. I wouldn't worry about your baby now, or even in the future unless he is having major separation anxiety or something.