If your DH dad has blue eyes than it is possible for you to have a blue eyed baby. The brown gene is dominant so to have blue eyes you must have 2 genes for blue which means that your DH must have got one blue gene from his Dad (given he has blue eyes so must have 2 blue genes) and the brown gene from his Mum, remembering that brown being dominant so your DH has brown eyes.

My DS was born with beautiful blue eyes but they have now changed to brown. Mine are blue and DH are brown. I can't exactly remember when they changed, I know that when we were in the UK at Christmas they had changed to brown and he was 9 months old then.

Hope my little science lesson isn't too confusing!