Start with one-off essentials such as a cot, pram, car seat, clothing and changing supplies, then allow for ongoing costs including nappies, wipes, formula if needed and replacing clothes as your baby grows. Check what you can borrow or buy second-hand, but buy a new car seat and avoid used mattresses unless you can be confident they are safe and suitable. Also budget for changes in household income during parental leave and possible childcare costs when you return to work. You may be eligible for support such as Child Benefit or Tax-Free Childcare; check the latest rules on GOV.UK.