M.A.
My breastfed baby did not poop but every 2 weeks too. Trust me, your baby is NOT constipated and adding things like juice and cereal can actually cause more problems than they solve. I recently did a write up for my website on this very issue, so I'll post it here.
"Baby stooling patterns can be confusing. A common concern of nursing moms is that their baby is constipated. Starting at around 4-6 weeks, the stooling pattern of some breastfed babies changes. A baby that used to poop 3 or 4 times a day might suddenly start pooping every 3 days. It’s not uncommon for a baby to go 7-10 days between poops. A few babies go even longer than that! This does not mean that the baby is constipated. Constipation is a medical condition in which a person is unable to have a bowel movement and experiences pain and discomfort because of it. A baby that is exclusively breastfed is not consuming anything that would cause constipation; rather, the breastmilk itself is so easily and efficiently digested that the baby may simply not be producing enough waste to need to poop.
Your milk is perfectly designed for your baby and he or she can digest it so easily that there is just no need to poop for an extended period of time. There is generally no reason to offer juice, water, or laxatives to a baby who doesn’t need to poop. They probably won't work anyway because there just isn't any poop in there to come out. Additionally, if these methods are used too often, the baby can become reliant on them to poop. When your baby does poop, it will be a full diaper! As long as the stool is soft when it finally does come out, your baby is fine."
Here are some links with more info:
http://www.mother-2-mother.com/normal.htm#NormalStools
http://www.llli.org/FAQ/bm.html
http://www.associatedcontent.com/article/387567/the_diffe...
There are MANY reasons why you should NOT give your baby juice or cereal at this age. Again, here is a write up that I did for my webpage:
"The World Health Organization (WHO) and the American Association of Pediatrics (AAP) recommend that babies be exclusively breastfed for at least the first six months of life. Anything that is not breastmilk (yes, water too) is considered a solid. There is no need for water, juice, rice cereal or any other substance that is not breastmilk. Most babies are developmentally ready to start solids around 6-9 months. Once your baby reaches 6 months, watch him for the signs that he is developmentally ready for solids. See the articles below on what those signs are. Remember, NEVER offer solids (such as cereal) in a bottle. Among other things, this can actually cause a delay in the baby learning to swallow."
More info here: http://www.kellymom.com/nutrition/solids/delay-solids.html
So here's my advice: Stop the juice. Stop the cereal. Enjoy the fewer poopy diapers (because yes they do start pooping more when you officially start solids). Invest in a good stain fighter (I like Shout Advance) for when your baby does poop because those diapers will be HUGE!