Parent of 3 under 5 here. My personal view – This would only add more pressure to children and parents. Whatever happened to trusting your own instincts? Perhaps as children all grow and develop in such different ways and rates in the early years the best solution is not to try and 'fix' children via experts. Many parents might be crying out for this kind of service, but I certainly would not be one of them. Hope tha…
Both of these ends are somewhat irrational, with no one right solution. Especially so when it's a health issue, or living environment problem. Health calls for pediatrician attention.
There're already well established meeting point web sites for parents, like whattoexpect.com and similar. Which pretty much sooth parent's worries and give a variety of community-advices. As often as "it's a stage to grow over". And, in personal experience, we parents grow over it together with the kids.
Personally, I see benefit in a variety of resources vs. one central, no matter how expert, point. But I could understand busy parents' desire to source this from a single "curated" and customized place.