1st Tooth HELP!!

I have just felt inside Harlan's mouth today and there is a sharp bit on his bottom gum - so first tooth is coming through.  That's ok, but when would you class his tooth as through?  I want record this in his memory book, so not sure if it is when it is coming up, or fully up or what???  HELP, please......

I put it on the day it is clealy through the gum ie sharp - ie today. That's mostly cause it's tthe only definite date. Oh and maybe a tad because I'm excited

Thanks team for your help! 

Wow it's the season for teeth! Elle cut her first one last Wed too (jinx Charli) but the second one hasn't appeared yet. I've heard they come in 2's so I presume it'll arrive soon.

Tayla been grizzling for the past 2 weeks in her sleep, her cheeks are rosey red, still waiting, I do wish they would hurry up she nearly 6 months.

My little Ollie still hasn't got any teeth and he is 8 months old this week he has had signs of teething though with the red cheeks and crying in his sleep some nights but this has been going on for ages. I guess it can take months for teeth to come through sometimes.

Mummy2One, Briona did that too, she cross-cut all over the place and excepting eye teeth (just come through) and the last set of molars (ages away?), the last tooth was in the front down the bottom. Weird!

Gaaaaaaaaaah! Teeth! Elle cut her first one last Wed and has been a right little monster ever since. She is "spirited" at the best of times but has been grizzly, intolerant and fiesty all week. Should I put this down to the second tooth cutting (it's not yet here but I presume it is on the way)? She is well and is sleeping fine, she is just miserable when awake. She used to grizzle all day every day but had 10 good days about 2 weeks ago but is back to constant grizzling again. I really hope it is teething and that the tooth cuts soon!!