It takes 40 wks for a foetus to reach full term maturity in single or multiple births. Multiple births are induced earlier if there are problems.
Absolutely not ! Twins are usually born within a short time of each other - rarely more than an hour apart. ========== Unless perhaps you are asking about sperm whale twins - those CAN take 18 months. I imagine that there are a few pregnant women who FEEL like whales by the time their twins are delivered.
The birth weight of triplets can vary significantly, but they are generally smaller than singletons due to being born prematurely and sharing the womb. On average, each triplet may weigh around 3 to 4 pounds (1.4 to 1.8 kg) at birth, but weights can range from less than 2 pounds (0.9 kg) to over 5 pounds (2.3 kg) depending on gestational age and other factors. It's common for at least one of the triplets to be born with a low birth weight. Overall, the combined weight of triplets is typically lower than that of single births.
The average birth length for quadruplets generally ranges from about 16 to 18 inches (around 40 to 46 cm). However, as with any multiples, individual lengths can vary significantly based on factors such as gestational age and the health of the infants. It's important to note that quadruplets are often born prematurely, which can also affect their size at birth.
usually, depending on the breed a goat has 1 to 4 kids. the average is 2. although, it has been known for goats to have up to 5.
An average cow will usually have one calf per pregnancy but occasionally she can have twins, and triplets very rarely.
Usually one, but occasionally she will drop twins, and even rarer still, triplets or quadruplets. But the average cow always drops one calf a year.
1 or two unless they are triplets or closer in age so between 1-4
On average, a woman can have 1 pregnancy every 9 months.
The average length of the pregnancy gestational period in humans is about 40 weeks, or around 9 months.
Humans have an average gestation period (time of pregnancy) of 280 days.
There should be at least be 40 weeks in pregnancy.
On average, for 28 days.