The infant bug is actually 3 bugs caused by the same action of carried sims.

I don't understand the reason for infants in the first place, too me they are too needy, what mother gets up in the morning breastfeeds the infants, before eating herself.  That is stupid and lowers the quality of the meal the infant gets.  Why can't mother get up eat breakfast and than breastfeed the infant.  Every time an infant needs something it makes you drop whatever you are doing even going to work to take care of the infant.  I had enough of the constant micromanagement of the sims because of infants in the house.  Use some common sense in reality I haven't known anyone that would not feed themselves first before they feed their kids especially when they are being breastfeed from the sim I would think it would be important to eat before you give them food.  Also the constant habit of putting them down in the crib is also annoying especially when they are not sleepy.  I got to micromanage my sim adults because when babies cry or fuse everyone in the house gets a thing to check on them and than they just stand there and do nothing for 2 to 3 hours.  I had to tell my male sim to leave for work 5 times because it kept getting canceled by infant micromanagement.  I had to tell my sim to take a show 5 times too.  All actions get canceled when infant cries or fuses, even important actions from another infant at this rate the game is unplayable.

I decided to look at my lastException.txt file so I asked AI if she know what it was and she took me to a tool that analyzes lastException files and the two recent ones had 179 unknown errors, the most recent one had an error with the posture graph.  Maybe that may be the reason for all the lag.  If I remember right that was the same time my sim was interacting with the infant.  The 179 errors seem to be related to the sims posture graph, whatever that means maybe it is the mother or farther or both or the infants themselves, maybe it is triggered by something blocking a posture change or something like another sim. 

I think I found the bug the AI in Windows 11 is teaching me how to read code, I know C, but I didn't know C++, from what I understand the lastexeption file gave me what I needed to look for.  There seems to be a few different bugs that are all related to the current bug a desync in the saving of certain sim data most likely related to infants, when the game is saved the location of the infant is not remembered so the infants spawn on the floor more likely to prevent infants from getting stuck inside the crib.  The second one has to do with the positioning graph for infants which don't exist yet as they are objects until they learn to walk.  The error occurs during pickup of carried sim, which causes a forcestop or hardstop of all other interactions the sim may have been doing.  Here are the two lastExemption files.  The error occurs both with pickup of carried sim and horse riding.  Other one is related to saving while a sim is in the proccess of picking up a sim or holding a sim, or the sim is on top of an object.

Edit: It is not letting me attach the last exception file to the section, do I need to do it one at a time? Because I found the location of the bug it is mentioned in the lastexeption file.

I been trying to post the lastexception files to the infant bug location and it keeps dropping the last exception files when I post it.  There are 3 bugs related to the infant bug, one is located to saving while sim is carrying another sim, and the others is related to two sims get the check infant status of the same infant that leads to a hardstop code that makes the sims cancel all actions.

I know that people want it fixed and the lastexception points to the location of all the problems with all 3 bugs, knowing now that the problem is associated with 3 bugs may help separate it out, it is also related to horses too because they also use the carried sim actions.

I hope you can help me.

I guess they don't want their game fixed because I give up every time I try to send the lastexception file it deletes it before sending it both on a new bug report and on the other one.