C.M.
1. Leave baby in the pumpkin/carseat with the shade over him. You can go anywhere/anytime of the day.
2. Take a stroller and put baby in that (in the pumpkin seat). That way you are not lugging around a baby and holding the hands of a toddler!
3. Get a sling and wear baby so you can take your 2.5 year old outdoors, to the park, etc.
4. Go out only in the mornings or evenings when the sun is not as strong if you are just going to be holding baby.
5. By June, your baby should be able to sit in a bumbo (or maybe July). Get one and take it with you but be sure to keep a hat on the baby.
6. Ask your mom to watch your youngest a few hours each week so you and your son will have some alone time! Do something you can't do with a baby - go swimming, go to the library, etc.
Good luck and congrats on your new addition!