This "starting" point may or may not change throughout ones life but in general does not start until one is at minimum a few years old.
1}When the egg becomes fertilized.
....note: So just as some memories of ones life stick around, it would never be clear to me at what date they occurred. My earlist memories I can place and approximate date on, are those I can reference to events in 1st or 2nd grade, and one to my 6th birthday party.
2} cleavage [ dividing of fertilised eg/cell },
3} blastulation,
4} gastrulation { 3 germ layers --trinary set-- are formed } and the primitive streak is formed,
....note; ..."What we are actually seeing when we look at a primitive streak are moving cells. They are going from the epiblast and moving down so they end up between the original epiblast layer and the hypoblast. I’ve always imagined the motion like water falling down a waterfall. The first layer to invaginate [---inversion---] dives the deepest and ends up closest to the hypoblast – this is the endoderm. The next layers will become the mesoderm, and the cells of the epiblast that continue to border the amniotic cavity are the ectoderm.
5} neurulation as result of inversion forms noto chord,
.....Space(>In<) i (>In<)Space........
Does the Uinverse invaginate/invert before a a BIG BANG! { patriarchal } aka the The Big Grunt { matricarchal } or as The next WOW! { non-gender specific }
The egg is biologic life as is the sperm, and together they create synergetic individual that may some day be born-out as an independent individual that takes its first in-spire-rational breath air/oxygen.
Synergy = organize { to cay i.e. to gradually form collective set of organization, sand, rock, biologic coral }
Death = decay { disintegrate /disorder }