@simsplayer818 I love your ideas! Registering them with 'Ministry of Labour' for working from home is also a great plan! @OkayLazySim I have also used vacation days, and I love the idea of adding a holiday/vacation to the calendar to help out!
In my game, I either have one parent quit their job (usually after collecting all the family leave they can), then work/produce income/save expenses from home somehow... Or...I add an adult Sim (better yet a grandparent) to the household that I can have watch the infant/toddler while doing something from home (for productive income/time use). As @simsplayer818 stated, there are many options for working from home. I have also done the workaround method of living on a retail lot and having them run that. I enjoy the concept, and the ability to control how they use the time with the infant/toddler for care, relationship/social, and developing of skills.