They're lovely shots James of your little one. The strength of the backlight is a little too high to balance, assume ithe sun was high in the sky If you shoot backlit later in the day, when the sun is lower and less intense, you can balance the exposure easier. If you push the exposure as is, you will completely lose the top of his head. Alternatively, try having a tree taking some of the intensity out if possible. All the same, a nice memory captured, and there's nothing more rewarding!