I also have trouble gaining weight, especially during pregnancy and have also been consistently "behind" in fundal height through both my pregnancies. I gained 26 with my first and 22 with my second. I gave birth to two healthy babies weighing 7lb1oz and 8lbs2oz. I also had a CNM for my first pregnancy and most of my second. They tend to get more concerned because of the protocols they have to follow for their licensure. They usually have you do food diaries to keep track of your protein intake (which should be around 60g a day) first. But, when you fall behind a certain amount for several weeks (usually 3-4 cm) then they must order a growth sono.Â
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This is your second baby, so can you remember your growth pattern with your first? Did you fall behind part way through and then catch up? Did you have periods of no fundal growth followed by a leap in growth? If you can recall your pattern, this should help quell some of your midwife's concerns. You could offer to do a food diary instead of having the growth sono. Remember that sono's in the third tri are highly inaccurate so you can't really trust the weight estimate. It can help rule out other issues that *could* be happening with the placenta.
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But, I want to throw out there that you may just grow babies in a different way and that way is not bad or wrong. If you know that you're eating enough, stand up for yourself and your body. I switched to a CPM near the end of my second pregnancy and was much happier. She didn't even weigh me and was totally unphased by my fundal height.
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As for foods... focus on high calorie/high protein foods like avocado, nuts/nut butters, meat if you eat it, cottage cheese, etc. Good luck!