It takes some patience, but if you keep dropping the couple together repeatedly they will eventually quit arguing, 'kiss' and start trying for a baby. Of course, if one or both would benefit from a Baby Booster shot then nothing would happen, but at least you've tried.

When you accumulate enough coins don't be tempted to give a peep a Baby Booster shot without first getting a doctor's opinion; they might not in fact need one and you'd be wasting your money.

At least you've got two kids who will be able to carry on into the next generation!