I want to buy hubby a gift to celebrate the birth of our baby - any ideas what to get Him?

Typically, it's the other way round where the husband buys a push present for his wife to thank her for a smooth delivery. A manly diaper bag from DiaperDudes would make him WANT to carry the diaper bag, so that's an option. If you could wait, I'd like to recommend keepsake cufflinks or keychains, which you can create using breast milk, cord blood stumps or hair.