This worked for the first 5 months with my baby boy...than he grew out of the onesie at 6 months. He is a very tall boy for his age. But it was still fun to see him grow so fast.
Here is the collage I made for him out of his monthly pictures in the onesie:

I know there are a lot of new mother's out there and I thought I'd share this fun idea. I am starting to do this with my new baby girl, go figure she was born a lot smaller than my boy was and I bought an 18 month onsie just to be safe - I guess we will see if it works out!
And you can start the documentation at any stage - if you have a month old just start with the one month picture and document until 12 months.












I took the hand towel and cut 1/3 of it off; than I took the finished edge and sowed it together (this forms the hood). I had to hand stitch the edge because it was to thick for the sowing machine.
I measured the big towel and found the middle and sowed the hood to it. (If your towel is a loose knit you may have to pinch the material in the middle at you are sowing the hood on because the material moves a lot).

Here are all of the ones I have made so far.