Oscar was five or sixth months old when he started to gain weight a little too rapidly. All the literature had warned that he would be hard to feed for the first few years. Then a "switch" would flip and he would be constantly hungry. We expected hyperphagia and rapid weight gain to set in anytime between ages two to five.
But at six months?
Our pediatrician restricted his calories to two-thirds the usual amount recommended for his weight, as is typical for people with PWS. We recorded how many ounces he drank at each feeding and made sure to stay within the daily limit. When he started eating solids we measured his portions and created a calorie spreadsheet. (Eventually we would learn to eyeball it.)
I don't know if it was Oscar's slow metabolism or his lack of satiety that led to the early weight gain. But I do know that as soon as he was able to sit in a high chair and eat solid food, he was eating everything we put in front of him. Every steamed carrot, every cheerio. He never, not once, threw anything overboard. He didn't appear to be always hungry, but even at this early age it seemed like he was never full.
Here's one of my favorite photos of Oscar at seven months, around the time of that weight gain.