Both my lovelies were reflux babies. With my DD it was 3 long mos of me suspecting she had it. When the ped said it was "colic" I about lost it on him. I switched peds, she confirmed reflux, started meds and I had a new baby! With my son after his first bottle I knew he had reflux but his ped made me wait until 6 weeks before she'd allow me to give him meds.
I was also the terrible mom who let her babies tummy sleep! With reflux it was a necessity! It was actually a nurse in the hospital who told me to do it on the DL. Most of us tummy slept as that was the rule back when we were babies. Both my kids could hold their heads up almost as soon as they came out of me (My DD honestly did hold her own head up at birth, LOL). I wasn't worried they would smoother themselves. They obv both made it. Not sure if they would if they slept on their backs, LOL. I tried it. They screamed in pain all night long. Oh and my kids HATED the swaddle. They both busted out of the ones the nurse did immediately. Makes sense, they were BIG TIME movers inside of me (and huge babies, 9lb8oz and 9lbs4oz). My babies wanted to be free.
For me the godsend though was "Happiest Baby on the Block". It became my sleep bible. Yes, you are sleep training. Yes, they cry. But my kids were not sleeping past 1 REM cycle. Once I "trained" them, they went from 30 min naps to 3 hour naps, and they both napped til they were 4! My sister finally gave in and had me do it w/ my nephew when he was 7/8 mos old. She couldn't take the short naps and overtired baby. The first 2 days she wanted to break down (when he cried) but then he started the 3 hour naps and she was a believer, LOL. She however took it to the absolute extreme when it came to no longer missing naps or moving them.
It's funny, when I had kids (and she didn't) it was always about how I wasn't flexible. I was forced to have my kids skip naps, etc. She didn't understand why babies weren't happy having dinner at a restaurant at 9pm. Then when it came to hers, well our world had to revolve around their schedules. Atl least my BIL did apologize to me once. He's like, dang I didn't realize how much you accommodated us when the kids were younger. Yes, Mike....now you know that an overtired baby who didn't nap isn't going to want to sit through a 2 hour dinner at 9pm, LOL.