You must take the leave as a single week or 2 weeks together. You cannot split the leave up into shorter breaks. The leave must be taken within 56 days (8 weeks) of the birth of the child. You should give your Employer 4 weeks notice of the fact that you wish to take leave, and provide the expected date of birth.
You are entitled to return to your job with no changes to your contract.
These rights are in addition to the right to 18 weeks’ parental leave (See Parental Leave for more details)