Not speaking yet

Baby is 13 months and she doesn’t say words yet. It’s basically all babbling but she does babble a lot. She understands a lot of what we’re saying. It’s hard not to compare. So many other kids her age are already saying words.

I’m a ftm and worry about all her milestones. Is this normal? Will something just click one day and she’ll start speaking or is it more like a gradual process?