Congrats on your first baby, and hang in there, colicky babies are really tough! From what I've generally heard, Similac Total Comfort tends to work well for babies with gas, fussiness, and mild spit-up because it's specially formulated to be gentler on the tummy, and it's also quite filling, so some babies settle better after feeds. One mum friend did mention her baby took a little while to adjust to the taste at first, so don't panic if your baby seems fussy about it in the first few days. NAN Sensitive is also a solid option, especially if your PD suspects protein sensitivity is the root cause of the colic. Honestly, it can be a bit of trial and error, both are reputable choices, so just monitor closely after switching and give it at least a week before deciding if it's working.