Ok, that colour is darker than I expected when you first said "light tan". It's not impossible, but it's going to make for some very tricky masking.
However, if you're game, and have the time to spend on it, you would do it by adding a Solid Color layer of the colour, and setting it to "Multiply" blend mode, then lowering the layer opacity until it looks the way you'd like it.
Then begin the careful masking around the child.