Sore and stiff all over?

A couple days ago I held my 20 lb. granddaughter in front of me using my hands. The next day I had extreme pain in my thumbs and wrists. I figured I strained them holding her. but now my knees, ankles neck and arms are stiff and sore. I feel good otherwise, so I don't think its the flu or anything, but I can't believe I could hurt this bad all over just from holding a child. Could it be something more serious?