DD2 is 5mo and nearly always has clenched fists. another mum asked me if i was worried about it - well, i wasn't until she mentioned it! should i be? she will open them if you give her something to hold, or when she is feeding she opens them to 'pump'/stroke my breast but if she is just sitting/ lying aroud, they are clenched. she is an avid thumb sucker so has them clenched for this. they are not clenched when she sleeps.
so... should i worry?