This is me. I don't usually get in front of the camera these days. In 6 yrs I've put on 10kg. Yet incredibly in those years I have been pregnant 3 times and during each pregnancy I gained no weight nor lost any. Then during the short periods in which I breast fed I lost a couple of kilos.
So by my amateur calculations I had 36 months in which to gain weight. That is 10 kilos in 3 years.