Do you find that tracking and observing infants and toddlers language acquisition to be fascinating?

Have 5 month old grandtwins. A boy and a girl. Savannah has been talking and cooing since the 1st month. Kale not so much so. The other day I caught video of Savannah making sounds for the first time by controlling her breathing (just the first 10 seconds gives you the idea. The rest is so Corrie and I can watch it again in 16 years and cry!)
Today Corrie texted me and said Savannah has been talking to Kale all morning. He just stares at her! It’s pretty accurate to say “Savannah talks and coos. Kale makes car noises and drools.”
I have an 18 month old granddaughter. She knows maybe, 20 words, but she’ll speak in whole sentences using nonsense words. Often they end as a question. The cadence and syntax is spot on. It’s cool!