Re: balancing solids and Breastmilk for my 4 mth old
The American Academy of Pediatrics (as well as Unicef, the World Health Organization, etc) all recommend that babies get nothing but milk or formula until at least 6 months. Is there a specific reason why your doctor wanted your baby to start so early?
That being said, LOTS of mamas feel like they don't make enough, but they almost all do. Being away for 5 days surely did hurt your supply, but there's no reason that it can't be increased just by putting your baby to the breast whenever he or you want, at least 8 times every 24 hours. What did your baby eat while you were away?
For an exclusively breastfed baby, pooping only twice a week is totally normal. Not sure how that changes once you start solids - when did you start?
Waking up 3 times a night at this age is totally normal; babies this young need to eat all day & night long.
So, others will advise you too, but what I would try to do is wean him off all solids (again, unless there was a specific medical reason your ped wanted him to start) and put him to the breast more, as much as possible.
You might find some ideas about how to do that here: http://kellymom.com/bf/got-milk/basi...rease-formula/ - it's about weaning from formula supplements, but you could imagine how to wean from solids in a similar way.
Nursing, pumping, cloth-diapering, babywearing, working professor mama with the awesomest SAHD ever.