When Benjamin started crawling at 6-7 months, I was told "He's hurrying up to get out of the way for the next one."
His sister was born twelve months later.
When Sarah stood up on her own for the first time at 5 1/2 months, I was told "She's hurrying up to get out of the way for the next one."
I got pregnant again twelve months later.
So far, my youngest three have been born in '05, '07 and '09.
Mary has not yet had her first birthday, and look what she started doing a few weeks ago....
Should I be worried?