Most caucasian babies have dark blue eyes at birth.

the gene for blue eyes is recessive, and barring gene mutation, for a child to have blue eyes, both parents need to a have the gene for blue eyes.

Since you have 2 genes for eye colour, one inherited from your mum and one from you dad, your DH must have 2 genes for blue eyes.

You could either have 1 for blue and one for brown, or both brown (what colour eyes do your parents have, do any of your siblings have blue eyes..)

DS had blue-brown hazel eyes for 6-7 months before they went completely brown. (I have blue eyes, DH brown, but his mum's are blue so he has 1 gene for each)

HTH and not too confusing