eh. with babies, it's harder to judge. all of my brothers were about 35lbs when they were 1 (that's about 15 pounds heavier than normal) on breast milk alone, and none were fat children or fat adults, nor are my parents fat. my nephew is the same. he looks about as fat as that baby, but he's never eaten anything but breast milk. on the other hand, my sister and i were both small babies eating breast milk from the same mom and were both tiny and about 16lbs at 1. when they get to toddler age and start running around the weight just falls right off. if a kid is still that fat when they're walking, then you should start to worry.