This seems to vary from family to family / child to child.
I wouldn’t describe anything (after maybe the birth itself, which I can’t answer about) related to our 6 month old so far as “difficult”. It is only “physically taxing” insofar as it takes a lot of time every day, and alongside other obligations (in particular, the 3-year-old) that leaves everyone a bit sleep deprived. I would say the 3-year-old takes at least twice as much time and 5x as much effort. (The work is stuff like reading books together, building block towers, running around the playground, preparing food, etc. Nothing especially challenging by itself.)
My wife gets burned out pretty quickly when I leave her with both kids on the weekend for most of a day. She’s generally relieved to get back to the office on Monday and leave them to me. :-)
I wouldn’t describe anything (after maybe the birth itself, which I can’t answer about) related to our 6 month old so far as “difficult”. It is only “physically taxing” insofar as it takes a lot of time every day, and alongside other obligations (in particular, the 3-year-old) that leaves everyone a bit sleep deprived. I would say the 3-year-old takes at least twice as much time and 5x as much effort. (The work is stuff like reading books together, building block towers, running around the playground, preparing food, etc. Nothing especially challenging by itself.)
My wife gets burned out pretty quickly when I leave her with both kids on the weekend for most of a day. She’s generally relieved to get back to the office on Monday and leave them to me. :-)