Yes, you read that right. Twins (non-identical) can be born at completely different times, sometimes even years apart.
The longest interval between the birth of twins is 90 days, in the case of Molly and Benjamin West, dizygotic (fraternal) twins born in Baltimore, Maryland, USA to parents Lesa and David West (all USA) on 1 January and 30 March 1996.
Multiples are generally born only a few minutes apart. If delivered by cesarian section, the interval between births is usually only a minute, maybe two. The interval is generally longer for vaginal deliveries, ranging from a few minutes to more than an hour.
It's called superfetation. The result is two fetuses who are developmentally at different stages of growth because they were conceived separately. For context, there have only been about 10 confirmed cases of superfetation twins. Though they are gestationally different ages, they tend to be born together.
Medically, this 7-year defect is very rare. Twins are typically born with a bit of a delay — a few minutes to a few hours. Some even have separate birthdays, due to being born just before and just after midnight.
So yes, larger age gaps are not as common as smaller ones. But that doesn't mean they are any less valid or ideal. Although you are somewhat less likely to meet a family with a four- or five-year gap—much less an eight- or nine-year gap—there are plenty of these families out there.
Vaginal Birth of Twins
This means you will have to push twice, but the majority of the time the second twin is born much more easily than the first. This is because the first twin has paved the way, so to speak. The average time between the birth of the first and second baby is generally about 17 minutes.
While the typical definition of Irish twins is two children spaced 12 or fewer months apart, people do sometimes use the term more loosely to include children born 13, 14, or more months apart, particularly if the children end up in the same grade in school.
Monoamniotic-monochorionic Twins
This is the rarest type of twin, and it means a riskier pregnancy as the babies can get tangled in their own umbilical cords. If you have monoamniotic-monochorionic twins, your healthcare provider will monitor your pregnancy closely.
Supertwins are four stroke twin cylinder machines originally sold for road use with a water cooled engine of up to 650cc.
Twins with different birthdays are rare, and the chance of twins being born in different years is 1 in 2 million, according to the news release by Natividad. Though the incident is rare, it's not the first time twins have been born in separate years.
In 5% of the MZT cases, the splitting occurs 8-13 days after fertilization, resulting in monochorionic-monoamniotic twins (one placenta and one amniotic sac). Rarely, the splitting occurs after 13 days, resulting in conjoined twins.
The longest recorded human pregnancy was 375 days, or just over 12 and a half months, according to Guinness World Records. During this pregnancy, a woman named Beulah Hunter gave birth to a healthy baby girl in 1945.
The DNA of monozygotic twins tends not to be 100% identical, and epigenetic and environmental differences further widen the gap between twin pairs. It's not nature or nurture; it's a complex interaction between our genes, our environment, and our epigenetic markers that shape who we are and what illnesses befall us.
Twins are at increased risk of fetal and infant death compared with singleton births. 1-3 The increased risk is partly the result of the lower birthweight and gestational age at delivery of multiple pregnancies. At particular risk are monozygotic twins who have poorer survival rates than dizygotic twins.
The Dutch Twins are Kit and Kat, 5 years old and not yet big enough to be called by their real names, Christopher and Katrina. They live in a typical Dutch household, around the turn of the last century. The book follows their day-to-day adventures and accidental mishaps.
Mirror twins, or mirror image twins, is a term used to describe a characteristic of some twins whose features appear asymmetrically—that is, on opposite sides. When these twins are facing each other, it is as if they are looking in a mirror.
They come from the same fertilized egg and share the same genetic blueprint. To a standard DNA test, they are indistinguishable. But any forensics expert will tell you that there is at least one surefire way to tell them apart: identical twins do not have matching fingerprints.
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.
Anything over 5 years is considered a large age gap. This could be planned or is sometimes a whoopsie or just situational, such as children from different relationships. A larger age gap doesn't mean siblings can't be close, it is just will be a different type of relationship.
For those who'd like to put a number to things, usually, a gap of 1-7 years can be considered an acceptable age difference between adults. People whose ages are within 1-3 years typically do not see much of an age difference, while years 4-7 might begin to feel a little bit more pronounced.
6 years isn't too much of an age gap to not like the same things. Now that Birch can talk and run, the games they have in common have increased – especially open-ended, imaginative play, builds developmental skills for both of them despite their age difference!