take a good brand grooming kit.there is a small nail cutter in it...U need to be very carefully intally..if possible cut in babys  wet hands,i t will be easy

<font color ="#3b5998"><b><a href="http://app.babychakra.com/article/1290">The beginner&#8217;s Care Guide for your baby&#8217;s eyes, ears, nose, nails and teeth</a></b></font>

cut right after bath when baby is asleep. After bath nails will be soft. Cut it straight across