Re: 6 months... milk supply seems to be dwindling
Welcome to the forum and congratulations on making it to 6 months!
It's very common for moms to have a big supply drop after they have been back at work for a while and also after they introduce solids. It's the old supply = demand equation coming back to bite you. Less demand due to less nursing or limited pumping time will eventually translate into reduced supply. Usually moms do fine when they first return to work because milk supply is generally overabundant in the early weeks/months of breastfeeding. But unfortunately for working moms, that overabundant supply doesn't last.
The best way to increase supply is to increase stimulation to and milk removal from the breast. That means nursing more and pumping more, and also using the best pump possible. That may mean getting your pump reconditioned (even the best machines wear down with use), or simply purchasing a better machine. You may also want to check your shield size, since that sometimes changes with time and poorly sized shields reduce stimulation to the breast. I think you really need to find a way to fit more pumping sessions into your workday. 2 pump sessions in a 13 hour period is just not enough unless a mom is vastly overproducing milk. If you can pump while you are with your baby, in addition to nursing, that will also help. Does your baby nurse at night, or is she sleeping all the way through? Nursing her in the night is another great way to boost supply- though I feel bad even suggesting it to someone who is working outside the home!
Poop issues when solids are first introduced are really common. Your doctor gave you very good advice about ditching the cereals and going back to exclusive nursing. When you reintroduce solids, keep the quanitities small (a teaspoon or two per day is all a 6 month old baby needs- remember, at this age solids are just for fun and are not necessary for nutrition)- and also skip the cereals and go right to the fruits and veggies, since those are less constipating (with the exception of bananas and apples, which you should avoid for now).
When you say your baby's bowels aren't moving like they should be, what do you mean exactly? A 6 month old exclusively breastfed baby may poop as little as once per week, and that's okay. Only if an EBF baby is producing hard, dry, pellet-like stools, seems to be in pain when pooping, or is pooping less than every 2 weeks is there evidence of constipation.
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