When did they get so big??

Last night the girls were very sweet to mama who has a major head cold. They played quietly and didn't put up too much of a stink when I asked them to do things by themselves. Parker went right to bed like a big girl. She didn't even ask me to tuck her, Dora or Strawberry Shortcake in, she just said "Night mommy", and rolled right over into her sleep mode. I came downstairs to find Piper our 3-year-old working her 50 piece puzzle. It's a puzzle we got in Target's $1 bin, one that she insisted she could work even though it says ages 5 and older. She and I put it together one night a few weeks back. It took us about an hour, it's been awhile since mommy has concentrated on little puzzle pieces. But last night, Piper took it on by herself and what do you know? She got that thing put together in half an hour by herself! She kept squealing with delight everytime she got one segment completed, and you should've seen the look on her face when she finished it. She kept the puzzle together long enough to let mommy take a picture, then she took it apart to do it all over again. I've noticed here lately, that Piper's really into problem solving toys etc. She fell in love with a train set at a garage sale one day. While all of the other kids were interested in the trains themselves, she was more interested in taking the track apart and putting it together. Daddy and I are going to have to put a little more thought into the toys we buy her. Yes, she can still get the Barbies and High School Musical stuff she wants, but we are going to have to get items that gets our little problem solver's brain really going....man when did they get so big?