It would be nearly impossible to count the number of times patients tell us the following regarding how many embryos to put back into the uterus: “I want two…it’s like two for the price of one!” “I want to be one and done!” “It’s like getting a twofer!”
And while we understand the desire for two (trust us, the thought of minimizing the number of times one is pregnant does sound appealing), twins are not just double strollers, matching onesies, and names that start with the same first letter. Twins and triplets-plus can be complicated, not only for the babies but also for the mother. Therefore, serious thought needs to be put into how many embryos are put back into the uterus.
Old-school fertility doctors routinely transferred several embryos into the uterus at one time; twins, triplets, and even quadruplets were sort of the “cost of doing business.” Back in the day, our IVF techniques weren’t so great. The procedures were new, and there were a lot of unknowns. To increase a patient’s chance of getting pregnant, multiple embryos were put in. Although even then, “the more the merrier” wasn’t our motto, (women are not meant to carry litters!), we were limited in our ability to identify which embryos had the best chance of making a healthy baby.
Fast-forward 20-plus years, and we are actually really, really good at this stuff. Not only do we know exactly what a three-day-old embryo needs to grow in versus a five-day-old embryo (can you believe it they are already picky eaters at this age!) but we also actually have the ability to check them and make sure they have the right number of chromosomes!
Now, while we can’t tell if they will look like you or your partner or go to Harvard or Yale, we can take a few cells and check to make sure they have the correct number of chromosomes. (The magic number is 46!) When this technique is done and a healthy embryo is found, we almost routinely only put one back in because even this guy or gal more than half the time makes a baby.
If you are considering an IVF cycle or are maybe even in the midst of one, make sure to have a long and serious discussion with your doctor about the number of embryos to transfer back in. Nowadays, not every IVF center is the same; many have the ability to grow embryos in the laboratory to day 5, rather than the traditional day 3. Although two days may seem inconsequential when it comes to most things in life, for an embryo, it’s a big deal. Just these 48 hours gives the embryo time to develop and the embryologist who is watching the embryo develop more information to pick the one that has the best chance of making a baby!
If you are lucky enough to have several A-plus embryos and your doctor only recommends putting one back in, the others can be frozen. Yup, we said frozen. Don’t worry; frozen embryos are not like frozen chicken! Embryo freezing has come a long way, and now in many centers, frozen embryo transfers have a better chance at making a baby than a fresh one. Simply stated, you won’t lose anything from freezing the extra embryos and putting only one embryo back in at a time. Sticking with the “one and done concept,” many couples get all the embryos they will ever need in one fresh cycle, thanks to good freezing techniques!
It’s sometimes hard to imagine that anything can go wrong in twin pregnancies. Nowadays, our schools and parks are teeming with twins; it really has become all the rage! But take it from us, not every twin pregnancy ends in a cute Anne Geddes photo. Twins have a higher chance of almost all risky pregnancy complications. On the fetal side, these include stillbirth, preterm delivery, and the serious problems that can come along with having a preterm baby: neurologic, cardiac, pulmonary, gastrointestinal, and serious developmental issues. Additionally, a high percentage of twins will experience some delay (motor and verbal skills) in the first two years of their life that requires treatment.
On the maternal side, women carrying twins or more have a much higher chance of serious medical complications. These include diabetes, high blood pressure (preeclampsia), heavy bleeding, hyperemesis (significant nausea and vomiting), Cesarean Section, and post-partum depression. Although most twins and most moms of twins will be running (actually, probably sprinting) and laughing in no time, there are a number of twins that will suffer permanent consequences from prematurity. The risks are real and should not be ignored.
And partners of those who have twins don’t get off easily, either. Sure, they don’t have to endure the insane stretch marks, the prominent varicose veins, and crazy swelling that multiple babies in one uterus at one time can bring, but let’s face it, double the work comes with added stress on the relationship. Studies have shown that divorce/separation rates are higher in families of multiples. Having a baby is not easy, sleepless nights and long days can be beyond difficult; imagine multiplying that by two!
We live in America too, and trust us, we get it. Other than pounds, for most of us, more or bigger always seems to be better. Why have one of something when you can have two? While we are not going all one-child-policy on you, we are advocating having one child at a time. It will be healthier for you and healthier for your unborn children. While twins are adorable and the bond they share is unlike any other sibling relationship, we are big fans of taking it one step at a time if possible.
When building a family, slow and steady is the best and safest way to get to the finish line.