Carbonated water is slightly more acidic than still, so just be aware of your teeth and guts if you’re drinking heaps of it. Some people take issue with supporting an Israeli owned company, others don’t. There’s always other brands if that suits you, I know aldi does one called soda king that’s interchangeable with Sodastream.
Plenty of information on mums available in Australia, not so much for dads. The average age for first time mums in 2020 was 29.7, with the largest proportion (38%) between 30-34 years old. Anecdotally, I was a first time dad at 34, and my wife at 36.