Deborah Ruf's LOG and checklist are a load of pig's intestines IMO. It's hard, but really you just have to wait it out to see what sort of brain and child you have on your hands. No simple checklist is going to replace maturity, observation of the child and real testing once they're old enough.
I have to turn away from any lists that talk about early talkers, early walkers, early everything. Both my boys were very late sitters (11 & 9 months ... though both crawled before sitting unassisted) late walkers (18 & 15 months) late talkers (3 years and ... still waiting at 3.3 years for the younger one), so definitely not the "usual gifted path". But out of curiosity, I did do the assessment for both of them online and they placed in level 2-3 even with the late developments in speech and motor skills. With the younger one I had to lie on his age since he only just turned 3. So until the boys are old enough to get them tested with some reliability, we know very little.
