Actually its the canon way to handle birth. In nature a yukkuri would use leaves or similar to cushion the birth of a little one, or they would often break open and die or be severely injured. If we assume that injury causes rupturing of paste, then it would be even easier than usual for them to be infested.
Also, the mechanic was always there, I didn't add it, I merely applied it to beds whereas before it was always applied to toilets (since this is where yukkuris sleep. Part of the issue is actually graphical, namely that I dont have an actual sprite for the bed thats the proper sizing and positioning since thats just a placeholder, and this tends to screw up collisions a bit.
You don't need to play fullscreen, its a reccomendation for a much better experience, but it "should" work non fullscreen (things will just be much more spaced out when you maximize, so if you tend to maximize/restore constantly, you should only place objects in maximized mode. Also makes it easier to finetune placement.) If you play a game, have a pregnant yu, make a couple of beds next to each other, and then maximize the screen, the beds may or may not be next to each other depending on your resolution, they'll be in the same relative positions, but the total field has increased in size. The modded version got around this by asking you which size screen you wanted at the start, and locking you into that resolution, I don't plan on implementing that since it didn't work very well on my laptop. (I test everything at 2800x1880)
Further with your mold obsession, here's the actual code for it, simply replace the word sick with mold:
private void checkSick() {
if (dirty && (damage > 5)) {
dirtyPeriod += TICK;
if (dirtyPeriod > DIRTYPERIOD) {
setSick();
dirtyPeriod = 0;
}
}
else {
dirtyPeriod = 0;
}
if (sick) {
sickPeriod++;
}
}
This method is called once per tick right along with checkshit, checkfood etc.
To even have any chance of getting moldy, a yukkuri must be DIRTY AND DAMAGED more than 5%.
If these conditions are true, then dirtyPeriod has 1 added to it every tick. After 400 ticks of uninterrupted dirt and damage the yukkuri is infected.
In the original copy, there was no check for damage, and the dirtyperiod was equal to 300, not 400. So in no possible, conceivable way, is mold MORE of a problem in my version than the previous. In fact, it's actually been reduced in frequency.
Now, there is one trick here, in my version, populations are generally higher because of more screen realestate, players messing with more different types, more successful births and a higher breeding chance. This means, when mold does occur, it tends to wipe out far more yukkuri, simply because the population is higher and there is much more interaction.
Effectively, a child getting sick is now much more likely to kill the entire family since siblings are more likely to play and parents are more likely to lick lick. So while the actual odds of being infected are lower (provided you use beds or toilets...) the consequences are potentially higher because of the increased interaction. Think releasing a virus in NYC compared to rural Iowa.