I don't want to beat it to death, but.....look at the average infant head size on this chart:
Baby Infant Growth Chart Calculator - Head Circumference Age Percentile Graph
Now you have to convert circumference to diameter which still puts a 4" sphere at around 6 months of age. So, again why is in incumbent upon any builder or homeowner to take responsibility for a irresponsible parent who can't supervise a child under ONE YER OLD? Next code will be a safety net out there below the rail in case a child climbs the rail and falls off? Who comes up with these ridiculous "codes"? And why do "we" allow them? As you can tell I had enough of stupid codes in Florida that did zero except line someones pocket...not mine. I don't care how many straps or screws or nails you put in a roof truss, or how many roofing nails per square inch.....any sustained wind of 180mph is blowing them off. Sorry, but if I chose to live in a '52 Bluebird School Bus turned upside down on my own property, I really don't think it's anyone else's business. Ok,.......rant off:laughing:
That being said, I'm building my railing as safe as it needs to be, and I am confident it will endanger no one.