I've also become a defacto expert in infant body language without so much as reading an article from an expert.
Sure, infant mortality rates used to be much. much higher so you can't discount every resource available in modern times, but simple common sense (we all have that evolutionary intuition ingrained in us) takes you a long, long way. I've never so much as held a baby prior to my son being born and now I can pretty much doing anything with him hanging off me. I've also become a defacto expert in infant body language without so much as reading an article from an expert. You just know what to do and when to do it.