lifespan (EDIT 1) lifesize

[RiverNotch]

I return!

lifesize

before I dunno, I think "even before birth" sounded way more poeticall
pregnancy test 
egg sperm balloon
cell division body motion I mean, the last one did suffer, at this point, from a lot of temporal whiplash, but this time you may have cleared the road too much -- now it just feels dry. "balloon" is specific, sure, but at least "grow" had the same tenderness as how cell division usually seems, at least to my scholarly eyes. So yeah, I'm not really liking these first four changes -- at least until we get to "body motion", which makes me think of babies dancing.
dilation bevel headed first light Wait....a bevel headed baby? Zika?
empty belly to bloat lung screaming "Bloat lung" sounds like a disease. "Bloated lung", without the "to", would at least sound, I dunno, properly inflated. But good news is these two lines really, really, really get things going -- your turn to a drier, noun-ier style works here, pulls me out to the world like a vortex, especially with that flash of light not in first light, since I think babies get to experience light first even before they get out of the womb (only in that case it's all red and gray), but in SCREAMING.
devouring breast rice grilled cheese bag lunch Yeah, "breast rice" is weird, sonically. A funny image, too, although only when taken out of context -- the movement to solid food here, with its rapidity, works very well. I can see of those four lines you could maybe cut one, and in exchange add one for potty training here, a very important step I gleaned from Freud.
schoolhouse ranks and rankings bloody noses and kisses Well, you commented on my last poem in serious, so I hope you'll know why I'm (half deviously, half delightedly) smiling on "kisses".
eighteen pretending these words and days adult body growing Again, the skip over of adolescence, unless rankings, bloody noses, and kisses are all there is for most of it, in which case I beg to differ. But now perhaps the problem is mine, in that I consider this as if it were written objectively, rather than from someone specific's point of view -- say, Boyhood instead of Amarcord. But then the very pointed diction sort of supports the whole "Boyhood" argument.
monkey hanging from buildings over yellow night roads mocking death But say I did manage to swallow the whole Amarcord deal: this line, as with that last one, is just grand. Not too sure about changing "taunt" to "mock", though.
conceiving children from tooth red skin tattoos at bruise green thirty The change from "conceived" to "conceiving" is very welcome here, though.
body gravity back shrinking lower legs and arms bent forward Still slightly too advanced, but worded much better than before either way.
chasing the children raw brain tired past sun logic Considering the whole Amarcord deal, logic might slide.
into a mirror these children growing taller older Again, older feels too advanced -- though switching them around, masking the angst of "old" with the joy of "tall", might work.
my wife and I an empty house I mean, really, my main case was give a bit more to teens, and let the twenties and thirties linger as they always seem to (judging by my relatives', sibling's, parents' anecdotes, as well as a healthy dose of Octopus Pie, and not yet by experience), instead of rushing through them as you seem to have. So yeah, now I still see this as a rush, although having no real mid-life crisis at this point works (so that the rush to the end starting here works in general), especially since mid-life crises seem to be the purview of the upper middle class and up alone.
slow down sex and smaller older Again, older/older repetition doesn't ring right, though not as much as in my last read. And again, old people sex, EEW! xD
alone again and littler grayer Considering how the previous poem's rush to the end was, at least for me, a damn-fest, this line just slows the momentum a bit -- a bit that's unnecessary, really.
worry evaporating night dew And again, damn
we hold hands damn
going blind damn
until and damn.

I don't know -- not much has really changed, so I can't tell if the direction you're moving to is better or not. Considering this poem may be more subjective than how the speaker seems to speak (yeah, that "We" should have given it away, although normally people get most narcissistic when they're adolescents....I think. The current American elections seem to be proving the case against that), I'm slightly getting the lack of proper treatment for adolescence and them 20s/30s a bit more, but then the same thing holds true with the previous edition. So yeah, maybe the handling of childhood got better, maybe the handling of infacy (really, pre-infancy, with the massive extension in that direction) got worse, and maybe the handling of old age got diluted, but again, all of those as descriptions of this commentary's results are really just maybes. But then maybe that in itself is a clue: if a new edition only produces "maybes", then it probably (ach, more assured word please -- but then "definitely" is definitely too strong) failed.

What, among the generals, I am sure of is that the new title sucks -- nothing about this poem screams "lifesize", as surely others have done truly life-sized portraits before, and with definitely the "size" to support it (see Boyhood). Whereas lifespan -- well, it's plain, sure, but it's on point, and the piece has enough gems to compensate for that.