While there's no single universally recognized record holder, Jack and Isla O'Kane, born in 2014, were noted as potentially Australia's largest naturally born twins at the time, with Jack weighing over 4.2kg, and older records mention Tilma Jean & Joan Catherine Williams (1936) weighing 11lbs (about 5kg) each, highlighting large twins across different eras. The heaviest globally recorded twins had a combined weight of over 12.5kg, but for Australia, it's a mix of notable, very large births like these.
The worlds heaviest twins, with an aggregate weight of 12.58 kg (27 lb 12 oz), were born to Mary Ann Haskin (USA), of Fort Smith, Arkansas, USA on 20 February 1924.
Discovered by a photographer from Life magazine, Billy and Benny McCrary were the world's heaviest twins, at 743 and 723 pounds with 84 inch waists.
The twins, through a series of tests, who secured the title were Perth teachers, Yvette Moran and Linda Males. They are long-time members of TRA and they share some insights into the series, their twin bond and research participation in this special interview with us below.
The average birth weight of twins is around 5 pounds each, which is lower than singletons. Smaller babies may need extra care in the NICU, especially if they're born before 34 weeks.
The average birth weight of a twin is 2,400 grams, for a triplet it's 1,750 grams and 1,300 for a quadruplet. Compare this to 3,500 grams for singleton births. When you factor in prematurity and shorter gestation, birth weights of multiples can plummet to the region of 600 grams.
If your baby weighs less than 2.5kg at birth when at term (after 40 weeks of pregnancy), they may be considered smaller than normal. In 2021, just over 1 in 100 babies who were born in Australia weighed over 4.5kg. However, more than 9 out of 10 babies born at term (37 to 40 weeks) weigh between 2.5kg and 4.5kg.
The rarest birthdays in Australia are February 29 (Leap Day), followed by public holidays like Christmas Day (Dec 25), Boxing Day (Dec 26), New Year's Day (Jan 1), and Australia Day (Jan 26), with December being the least common month overall for births, as obstetricians often avoid scheduling non-emergency C-sections or inductions on holidays.
Alba's twins were monoamniotic-monochorionic and shared the same placenta, amniotic sac and fluid. MoMo twins are some of the rarest types of twins, making up less than 1 percent of all births in the United States.
While there's no official confirmation of a biological child, photos in late 2025 showed conjoined twins Abby and Brittany Hensel with a newborn, sparking rumors they'd become mothers, with their cryptic "Blessed" TikTok video fueling speculation, though experts note pregnancy is complex for conjoined twins, with one documented case existing. Abby's husband, Josh Bowling, later denied a specific fraudulent TikTok account spreading the news, and the twins have requested privacy, leaving the true identity of the baby and circumstances ambiguous.
Identical (i.e., monozygotic, or MZ) twins share 100 percent of their genes, whereas fraternal (i.e., dizygotic, or DZ) twins generally share only 50 percent of their genes.
The first wife (died ante 1770), of Feodor Vassilyev (b. 1707–c. 1782), a peasant from Shuya, Russia, gave birth to 16 sets of twins.
Billy McCrary died on July 14, 1979, at the age of 32, following a motorcycle accident in Niagara Falls, Ontario, en route to a Ripley's Believe It or Not! museum. After Billy's death, Benny tried to continue wrestling, partnering with André the Giant, but was not successful without his brother.
Marie Hutchens The heaviest baby to survive infancy weighed 22 pounds, 8 ounces (10.2 kg) and was born in Aversa, Italy, in 1955, according to Guinness World Records. This baby was born to Sig. Carmelina Fedele. Marie Hutchens I sure hope she had a c section.
The 10th, 50th, and 90th percentiles of birth weight born at the 37th gestational week were 2174 g, 2580 g, and 3125 g for male twins, respectively, and they were 2100 g, 2500 g, and 3000 g for female twins, respectively.
For a given pregnancy, the odds of conceiving fraternal twins are only determined by the mother's genetics, not the father's. Fraternal twins happen when two eggs are simultaneously fertilised instead of just one.
More bluntly, yes, you would be having sex with a shared sexual organ, which usually means that both will experience the same orgasm at the same time.
Discussion. The death of one conjoined twin is an indication for emergency surgical separation [7]. The dead twin usually puts the surviving twin at risk of death from overwhelming sepsis in the shared blood vessels as well as failure of the shared organs [8,9].
Between 2019 and 2023 the mean maternal age for women who gave birth in NSW rose from 31.0 to 31.4 years. The mean maternal age for mothers who gave birth for the first time rose from 29.6 in 2019 to 30.1 years in 2023.
49—Attaining particular age
(2) If a person was born on 29 February, subsection (1) will apply in relation to the person in each leap year and, in any year that is not a leap year, the person will attain a particular age expressed in years at the beginning of 1 March.
February is the least common birth month in the United States, in part because it is the shortest month of the year, with only 28 days or 29 during a leap year.
Adjust your diet by choosing fresh fruits and vegetables, which are nutritious but won't make the baby gain weight too quickly. Cut back on sugary and starchy foods.
Early term: Your baby is born between 37 weeks, 0 days and 38 weeks, 6 days. Full term: Your baby is born between 39 weeks, 0 days and 40 weeks, 6 days. Late term: Your baby is born between 41 weeks, 0 days and 41 weeks, 6 days.
This is called fundal height. A larger than expected fundal height could be a sign of fetal macrosomia. The fluid that surrounds and protects a fetus during pregnancy is called amniotic fluid. Having more of this fluid than usual might be a sign that a fetus is larger than average.