Postpartum I used to eat a lot of quiche! Instant, or heat for ten min. Add a bag of salad and microwave rice for a bigger meal.
I also liked fish finger sandwiches on sourdough.
Peanut butter on toast with fruit on the side as a very quick lunch.
You/DH can prep & cook chicken breast/salmon and keep in fridge then eat cold/add to a bag of salad and/or microwave rice.
Beans on toast can be really satisfying!
Chili and microwave rice.
Airfryer chickpeas and rice/salad.
Bag of frozen prawns take minutes to fry. Microwave rice (or microwaved bag of grain, Lidl and Aldi do great ones) with a salad bag.
Mozzarella and tomato salad with ciabatta.
Frittata is quick, have some pre chopped onion/tomatoes/mushroom in fridge to throw in.
Bagel, cream cheese and salmon with cucumber and other chopped veg on side.
That's around a fortnight of quick lunches if you prep some to last two days and your toddler can share many of them.
Snacks: babybel, chopped veg and hummus, nuts, dark chocolate, treats (I liked cake when I was breastfeeding- I developed a very sweet tooth!). I make mini banana and dark chocolate chip muffins (banana, oats, egg, yoghurt, oil, baking powder, chocolate chips). Make a huge batch and freeze!
Take care of yourself and congratulations!