Diaper blow outs

Michelle

Hi mommies. My son is 7 weeks old and the past few days he has been leaking out of his diaper with almost every poop. He has only been in size 1 for 3 weeks and I'm wondering if they're already too small? He was 10 lbs a week ago so I highly doubt he is near the weight for size 2, and the diapers still seem a bit big on him. Am I doing something wrong?? Of course we have had some leaks here and there the past 7 weeks but the past two days it's been every time he goes. It mostly comes out of the legs area, not up the back. Does anyone have any suggestions? Here are some pictures of his diaper:

Thanks!