When I first started my ds1 was 2.2 and I very quickly went from just him to 5 children aged 18m - 8y for the long 6 weeks summer holidays (M-F) and I hated it! Some days were ok but my ds found it very hard to adjust and it was just so full on so quickly. This died down a bit as I couldn't continue with some children when my own ds started nursery in the opposite direction to the school I was picking up from. Having less children was certainly better for me at that time as it gave me chance to start again and build myself up a bit. Now (6 years later) I prefer it when I have all 7 children (do most days) and we spent a LOT of time outdoors/on a trip out. I work 7am - 6pm, Monday to Friday and fairly often have overnight stays. Yes it's a full on day but it goes quickly, especially when out for the day or break the day up with a trip to the park etc. This week we have done:
Tuesday - junk modeling, garden play, trip to the park, played games, done puzzles and general play with a picnic lunch in the garden
Wednesday - day trip to an activity centre (soft play, ball pits, trampolines, role play area etc). It was 45 mins away so the kids had some chill time/sleep on the way/way back. We were there about 5 hours and I enjoyed the whole time (on my own with 7 children to watch but honestly, it was good - high vis vests a must though!
).
Thursday - Picnic at a big park about 20 mins away and lots of playing at the park, in the little wooded area etc. Pretending to make meals out of mud, grass, leaves etc (stiring with sticks), in the big grass area for ball games and a game of 'duck, duck, goose'. Garden play, free play, drawing, more junk modeling, games etc.
Friday - free play, puppet show, garden play, games, couple of hours at park about 10 mins drive away. Ball games, more duck, duck, goose, lots of running in the big field plus playing in the playpark. Playing Sports games on the Wii.
I couldn't have stayed in with them all, would drive me mad and they'd be bored. I had to learn what worked for me/us so I felt confident about taking them all out on my own. It's a lot easier now they're a bit older (more stressful with 4 under 18 months and a couple of big kids so couldn't all of these activities, had to think about what was safe etc.
So I'd say you're not a wuss but are just not used to it. And most definitely, our own children are the hardest work! This half term I have had both my boys (nearly 3 and 8) driving me mad, especially my 8 year old who is starting to struggle with the house full and the fact I only mind girls! He does love it too, just I guess he doesn't want it all the time. Unfortunately I am not in a position to do Term Time only (my husband has been out of work for a year and half and only just got a job offer so we've needed every penny).
If baby has to sleep in a cot, if they have a set time then plan around that so at least part of the day is spent out. Honestly, their behaviour is usually much better when out and about.