Meaning MAGGOTS as「head sliding up and in with rolling stream, come to the end.」Similarly,「repeatedly bobbing heads slowly moving and looking like ejaculate」is an excellent description of a huge infestation, but also describes quite well the motion of a single MAGGOT as it moves.「Sliding into the completed end」cycle of life (or,「completed and repeated」with some fonts). In the end, corpses and carcasses in the woods will be eaten by maggots and that process will repeat itself…with no teeth, maggots suck in what they eat, as do most newly-born mammals and young human children, of course with milky substances. MOSQUITO LARVAE are called 'wrigglers' due to the manner in which they propel themselves through water, squirming in a way that resembles very young human infants crawling and not using feet. It is no coincidence that some female mosquito maggots, after maturing into adults, suck in order to continue living and are carriers of many infectious diseases, passing on various viruses and pathogens from one host to the next. Male mosquitoes do not 'bite' or suck blood, only females. Not only that, but generation after generation of maggots and flies seem to never-endingly repeat as well, particularly if there remains no lack of a food source.
While the glyph is not identical to that for「child」there is some overlap in both use and meaning when applied as an element in sundry other glyphs, probably as a result of deliberate sarcasm on the part of the sages who invented these glyphs. In that vein, note that「maggot」as a little white crawling living thing is a Chinese euphemism for SPERMATOZOON that is「repeatedly bobbing, sliding in head(s) slowly moving in ejaculate」and hidden in seminal fluid, and this also may account for the similarity to「child」since at that time sperm were thought to be necessary in that regard.
「According to an ancient Chinese text, the Chinese viewed magnified specimens through a lens at the end of a tube, which tube was filled with varying levels of water according to the degree of magnification they wished to achieve. Ingenious, effective and repeatable in the home, today. That this occurred some 4,000 years ago in the Chow-Foo dynasty and more than 3,500 years before the 'father of modern microscopy' was born is quite remarkable. That these Chinese ancients achieved magnification levels of 150 times today's standard, or 100 moou, is breath-taking.」
[ https://www.microscope.com/about-microscopes-t-19.html 2011-04-23 ] …[T]he Chinese knew about sperm:「repeatedly rolling, head sliding in, with stream」is an excellent description of a huge infestation, but also describes quite well the motion of a single SPERMATOZOON as it moves.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: alone; mosquito larvae; small
Japanese EDRDG: mosquito wriggler as in the larval stage
Unihan extended: remaining, left-over; lonely