Parental advice, it's everywhere. You can seek it out and read until your eyes cross or you can try and avoid it, only to have anyone and everyone who has ever seen a child offer up their opinion. Even the most reasonable people you know will tell you how to raise and care for your child or children. But if there is one thing that is extremely pronounced when you have more than one kid, it's that every child is different.
I've fallen onto this trap myself: something worked for you with your baby or toddler, so you're happy to share "what worked" with anyone dealing with a similar situation. Need to get your kid to sleep faster, I'll tell you what we do because ours goes right down and has for years! Instant authoritay! But unless you're a family of irresponsible douchebags making overpopulation a personal mission, there's a catch to your experience.
Your sample size sucks.
n=1? n=2? This gives you confidence that you can generalize your experience to another family? To even another child? So far my two daughters couldn't be more different, and I've only known one for 6 months. Things that worked great for the Wee One have failed miserably for the Weer One. We've come up with new strategies and adjusted to a new little being with opinions and needs.
But one thing os for sure, there is no one size fits all for kids and anyone who thinks they have the solution for whatever your child needs is most likely full of shit, full of themselves, or both.