There are definite challenges to sewing with a three year old (and a five year old too actually). Those are his fingers on the fabric above. I find it easier if I get to press the foot, especially on small things or detailed things. If I want the boys to use the foot then I put it on a box for them so their shorter legs can manage. I try and be calm and not snappy but sometimes I think I'm crazy to let them help!
We have finished the Christmas pressies this morning with a bit more sewing. It feels great and I'm sure that it'll feel even better once they're wrapped up and ready to go. I have some photos to share after Christmas.