I don't think you have too much to worry about

My little Tatum never barked for the LONGEST time when we got her. We got her at 12 weeks old and I can't remember how long it took for her to finally bark, but it was a very long time. I was worried too, at first, because I thought maybe she couldn't bark....but eventually she did and I'm sure that your baby will too
P.S. - Tatum (now at a little over 2 years old) still isn't much of a barker at all. She RARELY does it - and it sounds sooo cute when she does

She has a very "tiny" bark and a raspy little voice lol...she sounds like a mouse

And hearing her *try* to growl is even cuter LOL

Just soo funny to hear!