how do I claim child benefit?

Once you have registered your baby's birth you can claim Child Benefit at: https://www.gov.uk/child-benefit/eligibility

The weekly rate is £20.70 for your first baby and £13.70 for subsequent babies. If you or your partner earn more than £50,000 a year, this will start to be taxed.

If you delay claiming Child Benefit it can be backdated for up to 3 months.