You can find the invisible infant crib with the footprint over here https://legacy.curseforge.com/sims4/build-buy/invisible-infant-crib
Please read everything before downloading this invisible crib
This was a requested item by fellow simmers.
This invisible crib does not work like our invisible cribs for our newborn sims. You can not move the infant with the crib and align them over any other custom crib like we used too. Our newborns were objects tied to the crib so they moved with the crib. Our infants are their own little sims so they reset like any other sim if you move an object they are in or that are near them. Also this crib can only be placed over an object that has no footprint. Here is a link to a tutorial on how to remove footprints https://sims4studio.com/thread/4629/remove-objects-footprint
So how does this work then?
You place the object you want your infant to sleep or lie down on. The height is infant cribs and toddler beds or you can use moveobjects on cheat and use the 9 button to raise the height of the crib to a bed as in my images.. So for my images I used one of our maxis double beds. Please note that I did remove the footprint from that bed before using it. Once you placed the object without a footprint down then you place the invisible crib with the white/gray swatch down. That crib is semi transparent so you can see where to place it. Once you are happy with the placement then you change the swatch to the bright yellow one. Your crib will then become completely invisible. You click on the height where the rails are to instruct your sim to place the infant in the crib. She will place the infant down in the invisible crib so it looks as if they are on your object you selected. If it does not align perfectly you can use alt and move the item not the invisible crib to make it look perfect ;) Please note if you try and use it over an object with a footprint then the sim will say they can't get there and show a routing issue. The footprint has to be removed from the object you want the infant on.
I know its very complicated, but this was requested by a few simmers so I went ahead and made it. I hope it comes in handy for other simmers ;)
I do explain it step by step in the images as well :) I have added 3 images on how to remove the footprint, just incase the link does not work for you guys ;)