Parenting payment with a new business will require you to provide profit and loss statements every free months. Given your business has been running a few months you'd likely be asked to complete details of profit and loss for past few months and an estimate of profit and loss for next few months. I had to do it just after ds was born and it wasn't the easiest thing ever, but also wasn't hard enough for me to decide the payment wasn't worth it.

Provided you lodge updated profit and loss details whenever you're asked to, there is little chance you would end up with any sort of overpayment