Not LV but I just got one of these and love it... baby's initials would be adorable.
http://www.mayabrenner.com/products/necklaces/letters-numbers-1
I just wanted to thank you again! 3 weeks ago I gave birth to my baby boy and have just ordered a yellow gold initial necklace from Maya Brenner like you suggested! I'm in the UK so it might take a while to arrive but I'm super excited!