The vast majority of babies conceived through IVF are born healthy. Large studies consistently show that IVF children grow, develop, and thrive much like their naturally conceived peers. There are some small, measurable differences in certain health outcomes, but the absolute risks remain low, and many of those differences appear tied to the parents’ underlying fertility issues rather than the IVF process itself.
Birth Defects: A Small Increase in Risk
A meta-analysis pooling data from over 28,000 IVF infants and 2.5 million naturally conceived controls found that IVF babies had about a 29% higher relative odds of a major birth defect. That sounds alarming until you look at the actual numbers: major malformation rates in the general population hover around 2 to 3%, so a 29% relative increase brings the rate to roughly 3 to 4%. The overwhelming majority of IVF babies are born without any structural abnormality.
Preterm Birth and Low Birth Weight
IVF pregnancies do carry a higher chance of preterm delivery and low birth weight, even when only singleton pregnancies are counted. Among singleton IVF babies born at 37 weeks or later, the risk of low birth weight is still about 2.6 times higher than in the general population. Part of this comes from the higher rate of twin and triplet pregnancies with IVF, but even single-baby IVF pregnancies show modestly elevated rates.
The type of embryo transfer matters. Frozen embryo transfers produce fewer preterm and low birth weight babies compared to fresh transfers (about 5.3% low birth weight versus 8.5%). However, frozen transfers come with a trade-off: babies are more likely to be larger than expected, with 20% classified as large for gestational age compared to 13.6% after fresh transfers.
Brain Development and Learning
Parents often worry about whether IVF affects their child’s cognitive or neurological development. The reassuring finding here is that the IVF procedure itself does not appear to be the issue. A study tracking children to age 9 compared three groups: babies born after standard IVF with hormone stimulation, babies born after a gentler form of IVF, and babies born naturally to couples who had struggled with fertility. All three groups showed similar neurological outcomes. The children of subfertile parents, regardless of whether IVF was used, had modestly less optimal neurological scores compared to children of fertile couples.
This points to an important distinction. The underlying fertility problems that bring parents to IVF in the first place may contribute more to subtle developmental differences than the lab procedures do.
For ADHD specifically, a 2025 meta-analysis found that IVF children had a 7% higher risk compared to spontaneously conceived children. The researchers described this as a small effect and called it “reassuring for parents and clinicians.” The increase was present in both boys and girls and, interestingly, was more apparent in full-term singleton births than in preterm or multiple births.
Metabolic Health in Childhood
Some studies have identified subtle metabolic differences in IVF-conceived children. One study in the journal Diabetologia found that ART-conceived children had higher fasting blood sugar (averaging 5.06 mmol/L versus 4.57 mmol/L in naturally conceived peers) and higher fasting insulin levels. They also showed signs of mildly increased insulin resistance. These differences were statistically significant but still fell within normal clinical ranges for most children.
Whether these small metabolic shifts translate into higher rates of diabetes or heart disease later in life is not yet clear. The oldest IVF-conceived people are only in their mid-40s, so truly long-term data is still accumulating. For now, there’s no evidence of a wave of metabolic disease in the IVF population, but pediatricians may want to keep an eye on these markers.
Blood Pressure Differences
Research on cardiovascular health in IVF children has produced mixed results. One study found that girls born after frozen embryo transfer had slightly higher systolic blood pressure (about 2.9 points higher) compared to girls born after natural conception. Boys showed no significant differences. These are small numbers, and it’s unclear whether they lead to any meaningful health consequences in adulthood.
Childhood Cancer Risk
A systematic review and meta-analysis found a 21% increased relative risk of childhood cancer in ART-conceived children. Specific cancers with elevated risk included leukemia (16% higher), central nervous system tumors (22% higher), and liver tumors (about 2.7 times higher). Those relative increases sound substantial, but childhood cancer is rare to begin with. The baseline risk of any childhood cancer is roughly 0.2%, so even a 21% relative increase keeps the absolute risk very low, around 0.24%.
Researchers have not pinpointed whether this increase comes from the IVF process, the hormonal medications used, or genetic factors related to the parents’ infertility. It may also reflect closer medical surveillance of IVF children leading to more diagnoses.
Imprinting Disorders
One area where IVF shows a more notable increase involves rare genetic conditions called imprinting disorders, where certain genes are abnormally switched on or off. Beckwith-Wiedemann syndrome, a growth disorder, occurs in roughly 1 in 4,000 IVF births compared to about 1 in 35,000 in the general population. That’s roughly a ninefold increase in relative risk. Even so, the absolute chance remains very small: 99.975% of IVF babies will not have this condition.
The leading theory is that the early laboratory culture of embryos may occasionally disrupt the chemical tags that control gene activity. Angelman syndrome, another imprinting disorder, has also been flagged as potentially more common in IVF populations, though the data is less robust.
What’s Causing the Differences: IVF or Infertility?
This is one of the most important questions in the field, and the answer increasingly points toward parental infertility as a major driver. When researchers compare IVF babies not to the general population but to babies born naturally to subfertile couples, many of the differences shrink or disappear. The study of neurological outcomes at age 9 is a clear example: IVF-conceived children and naturally conceived children of subfertile parents looked the same, while both groups differed from children of fertile parents.
Couples who need IVF often have underlying conditions, including hormonal imbalances, sperm quality issues, or genetic factors, that may independently affect pregnancy and child health. This doesn’t mean the IVF process has zero impact, but it does mean the procedure likely accounts for a smaller share of the observed differences than many parents fear.
Putting the Numbers in Perspective
IVF has produced over 12 million babies worldwide since 1978. The children conceived through this technology attend the same schools, play the same sports, and face the same range of childhood illnesses as everyone else. The statistical differences that studies detect are real but modest, and they’re measured across populations of thousands or millions of children. For any individual family, the odds are strongly in favor of a healthy baby.
Where small risks do exist, they tend to fall into categories that pediatricians already screen for: growth, blood pressure, metabolic markers, and developmental milestones. Staying current with routine well-child visits gives IVF families the same safety net that benefits all children.