There are limits as to what we consider safe. Under usual circumstances if there are more than 2 children under three years old or more than 5 children under the age of 12 a second babysitter is required. Please remember that membership of Hello Mums is for the care of the children of one family per membership. A separate booking is required for each family whose children are present. However, a second babysitter is only necessary when the above guide numbers are exceeded. In cases where children of other families are present at a booking there is a 50% surcharge in the babysitter's hourly fee.