The breastfeeding thing sounds strange. Have you recently begun eating new foods in your diet? Perhaps he is reacting to that. Nine months seems pretty darned young for a child to self-wean. My first thought is he's reacting to something you are eating. Or it may be that he's just not hungry for that, maybe he wants some solid foods. This does NOT mean that it's time to stop BFing. I don't have the time here to list all the reasons why it is important to continue with that, but please try to educate your DH on this matter!
re: naps...I don't agree with trying every two hours, because if baby isn't ready to nap then its a waste of everybody's time. What exactly is your routine for putting him down? A few suggestions: does he fall asleep in the car or stroller? Maybe a walk or a short drive would help. Or, if he likes to nurse and stay latched on, mabye you could sling him and nurse while you tend to/play with your older child.
It's common for babies to nap longer and better when they are beside a parent. Maybe you could time your baby's naps with your 4 year old's, and go nap with baby so he sleeps through the older one's naps and you aren't missing out with your older one.
Also, does your baby cosleep or is he in a crib?
re: naps...I don't agree with trying every two hours, because if baby isn't ready to nap then its a waste of everybody's time. What exactly is your routine for putting him down? A few suggestions: does he fall asleep in the car or stroller? Maybe a walk or a short drive would help. Or, if he likes to nurse and stay latched on, mabye you could sling him and nurse while you tend to/play with your older child.
It's common for babies to nap longer and better when they are beside a parent. Maybe you could time your baby's naps with your 4 year old's, and go nap with baby so he sleeps through the older one's naps and you aren't missing out with your older one.
Also, does your baby cosleep or is he in a crib?