You will get Child Benefit (used to be family allowance years ago) of about �17 per week. Also Child Tax Credit. If you had not been working then - on the figures you quote and assuming your husband works 30+ hours per week - this would be about �26 per week, reducing to about �16 when the baby is 1 year old. However, for this tax year your earnings are also taken into account, so the figure would be lower until next April.
If you did go back to work and had a registered or approved childminder then you would probably also be eligible for Working Tax Credit including part of the childcare costs. The amounts would depend on your income and child care charges.