Babies

babies that were twice as big as average How Can a Baby Grow To Be So Big? Are You Safe?

As mothers approach the final weeks of ᴘʀᴇɢɴᴀɴᴄʏ, they typically start asking questions about how much the 𝑏𝑎𝑏𝑦 will weigh and what that means for ᴅᴇʟɪᴠᴇʀʏ. Dᴏᴄᴛᴏʀs think about this too, they try to accurately determine the weight of the ᴜɴʙᴏʀɴ ʙᴀʙʏ so can make the best ᴘᴏssɪʙʟᴇ ʙɪʀᴛʜ plan. But predicting ʙɪʀᴛʜ weight is actually very difficult to do.In a recent study, one-third of women reported their OB ᴘʀᴏᴠɪᴅᴇʀ told them their 𝑏𝑎𝑏𝑦 might be getting “quite large” near the end of ᴘʀᴇɢɴᴀɴᴄʏ. In the end, however, only one in five of those women had a 𝑏𝑎𝑏𝑦 that weighed more than 8 pounds, 13 ounces or 4000 grams, a common threshold for labeling a 𝑏𝑎𝑏𝑦 “large.”

It would be nice to know the exact ʙɪʀᴛʜ weight of a 𝑏𝑎𝑏𝑦 before it’s ʙᴏʀɴ – it makes ᴘʀᴇᴅɪᴄᴛɪɴɢ sᴏᴍᴇ ʀᴀʀᴇ, but sᴇʀɪᴏᴜs ᴄᴏᴍᴘʟɪᴄᴀᴛɪᴏɴs like ʙɪʀᴛʜ trauma easier. But that’s just not possible, and our estimates of your 𝑏𝑎𝑏𝑦’s size can potentially cause unnecessary sᴛʀᴇss on mom and lead Dᴏᴄᴛᴏʀs to intervene when nothing is really necessary. Here are some things to think about as you approach the end of ᴘʀᴇɢɴᴀɴᴄʏ and are wondering what your 𝑏𝑎𝑏𝑦 might weigh and how this could impact your labor and ᴅᴇʟɪᴠᴇʀʏ experience:

What is considered a ‘big 𝑏𝑎𝑏𝑦’?

Picking an absolute cut-off is tricky. Typically, we consider estimated weights of babies that weigh more than 4500 grams (10 lbs.) as larger than normal (or “macrosomic”). But what we really want to know is whether your 𝑏𝑎𝑏𝑦 is too big for your ᴘᴇʟᴠɪs. Weight is just one factor Dᴏᴄᴛᴏʀs consider when we’re estimating the chances of a ᴘᴀᴛɪᴇɴᴛ sᴜᴄᴄᴇssꜰᴜʟʟʏ ʜᴀᴠɪɴɢ ᴀ ᴠᴀɢɪɴᴀʟ ᴅᴇʟɪᴠᴇʀʏ.

There are three parts to the equation that determine this: “The power, the passenger, and the passage.” The “power,” or ꜰᴏʀᴄᴇ ᴏꜰ ᴜᴛᴇʀɪɴᴇ ᴄᴏɴᴛʀᴀᴄᴛɪᴏɴs, is something we can only assess when ʟᴀʙᴏʀ ʙᴇɢɪɴs.The “passenger” refers to the 𝑏𝑎𝑏𝑦. His or her weight isn’t the only factor – the exact position of the 𝑏𝑎𝑏𝑦 within the ʙɪʀᴛʜ canal also plays an important part in making it out successfully. The direction the head is facing can make all the difference in how easily the 𝑏𝑎𝑏𝑦 descends in the ʙɪʀᴛʜ canal. “Passage” refers to the ᴀɴᴀᴛᴏᴍʏ of your ᴘᴇʟᴠɪs. When Dᴏᴄᴛᴏʀs do ᴠᴀɢɪɴᴀʟ exams toward the end of the ᴘʀᴇɢɴᴀɴᴄʏ, that’s what we’re trying to evaluate: How narrow is the ᴘᴇʟᴠɪs? Like the estimation of ꜰᴇᴛᴀʟ size, this isn’t an exact science, but it can help us determine a ʙɪʀᴛʜ plan for the day of ᴅᴇʟɪᴠᴇʀʏ.

Uʟᴛʀᴀsᴏᴜɴᴅ is not very reliable for estimating ꜰᴇᴛᴀʟ weight near term.

For a 9-pound 𝑏𝑎𝑏𝑦, an Uʟᴛʀᴀsᴏᴜɴᴅ’s predictive accuracy is typically 15 to 20 percent off. Which means we may over- or underestimate by more than a pound. Why is there such a wide range? Uʟᴛʀᴀsᴏᴜɴᴅ uses volumes to calculate ꜰᴇᴛᴀʟ weight. It takes measurements of the head, waist circumference and some ʙᴏɴᴇs and comes up with an estimate. But it can’t measure the density of the ꜰᴇᴛᴀʟ tissues directly. There is a formula for calculating ꜰᴇᴛᴀʟ weight based on standard measurements – but not all babies follow the rules for getting the weight accurate! There is no way to know exactly how much a 𝑏𝑎𝑏𝑦 is going to weigh until after the 𝑏𝑎𝑏𝑦 is ʙᴏʀɴ.

Who is really at ʀɪsᴋ for having a big 𝑏𝑎𝑏𝑦?

Certain health and ʜɪsᴛᴏʀʏ factors put mothers at ɪɴᴄʀᴇᴀsᴇᴅ  ʀɪsᴋ for having a large 𝑏𝑎𝑏𝑦:

Dɪᴀʙᴇᴛᴇs, including ɢᴇsᴛᴀᴛɪᴏɴᴀʟDɪᴀʙᴇᴛᴇs, is a concern, especially if the mom’s sugar levels have ɴᴏᴛ ʙᴇᴇɴ ᴄᴏɴᴛʀᴏʟʟᴇᴅ well during ᴘʀᴇɢɴᴀɴᴄʏ. High glucose levels in mom can ᴄʀᴏss ᴛʜᴇ ᴘʟᴀᴄᴇɴᴛᴀ and lead to high levels in the ꜰᴇᴛᴜs. As a response to these high sugar levels, the ꜰᴇᴛᴜs produces insulin, which stimulates its own growth. Mᴀᴛᴇʀɴᴀʟ ᴏʙᴇsɪᴛʏ is another big ʀɪsᴋ factor. The rate of macrosomia has ɪɴᴄʀᴇᴀsᴇᴅ  over time with rising ᴏʙᴇsɪᴛʏ rates. ʜɪsᴛᴏʀʏ of a previous big 𝑏𝑎𝑏𝑦. The trend is for successive babies to get bigger, not smaller, so this is something we would take into consideration.

What are the concerns about having a large 𝑏𝑎𝑏𝑦?

Immediate ʀɪsᴋs of a large ʙɪʀᴛʜweight for the mother are ᴅᴇʟɪᴠᴇʀʏ ᴄᴏᴍᴘʟɪᴄᴀᴛɪᴏɴs sᴜᴄʜ ᴀs ᴠᴀɢɪɴᴀʟ ᴀɴᴅ ʀᴇᴄᴛᴀʟ ʟᴀᴄᴇʀᴀᴛɪᴏɴ ᴏʀ ᴘᴏsᴛᴘᴀʀᴛᴜᴍ ʜᴇᴍᴏʀʀʜᴀɢᴇ Long-term ʀɪsᴋs include high ʀɪsᴋ ᴏꜰ ᴘᴇʟᴠɪᴄ ꜰʟᴏᴏʀ ᴅɪsᴏʀᴅᴇʀs ᴏʀ ᴘʀᴏʟᴀᴘsᴇ. For the 𝑏𝑎𝑏𝑦, there’s also a higher ʀɪsᴋ ᴏꜰ sʜᴏᴜʟᴅᴇʀ ᴅʏsᴛᴏᴄɪᴀ, or when the 𝑏𝑎𝑏𝑦’s head delivers but the shoulders don’t, and oxygen takes too long to deliver. Other potential health ᴄᴏᴍᴘʟɪᴄᴀᴛɪᴏɴs include low ʙʟᴏᴏᴅ sᴜɢᴀʀ ᴏʀ ᴀɴ ᴇʟᴇᴠᴀᴛᴇᴅ ʙʟᴏᴏᴅ ᴄᴏᴜɴᴛ, which could lead to the 𝑏𝑎𝑏𝑦 being admitted to a neonatal all-intensive nursery.

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