I've never bothered claiming child benefit for either of my DC because we'd have to pay it straight back in tax because my DH's salary is over £50K. My retired DM (62) kindly looked after DD1 for two days a week for c12 months while I worked before going on maternity leave with DD2 at the end of last year. DM could have been claiming national insurance credits for this period which would have contributed towards the 35 years she needs to earn a full state pension by the state retirement age. However because I wasn't claiming - and then rejecting - child benefit at the time, she can't now claim for that year. Going forward, I'm going to make a child benefit claim then choose not to be paid it. This at least means that I'm in the system and DM can claim NI credits when she kindly helps me with some childcare for DD2 in the new year when I return to work. Just thought I'd let others know really, in case they hadn't thought about it already.