You will need to register the birth of your child no later than 3 months after their birth. Registration is a legal requirement in Ireland, but you will also need a birth certificate to enrol your child in school, to apply for a passport and for many other purposes.(For Child Benefit, you will be contacted automatically as soon as you register the birth.).The birth certificate will contain the information on the child and the parents that is given at the time of registration, so it is important that the information given is accurate.For Child Benefit, you will be contacted automatically as soon as you register the birth.). The birth certificate will contain the information on the child and the parents that is given at the time of registration, so it is important that the information given is accurate.