It depends on the breed. There is so many different breeds, and sizes. Like a Fellabella (smallest horse) Colt yearling, would be tiny, but a Shire (biggest horse) Colt yearling would be really big. So there ISN'T a average size for any horse, unless you want to know about a certain breed, then I might could help you.
A veterinarian can estimate the due date during early and midpregnancy through palpation and ultrasound; however, the foal is too big during late pregnancy to measure completely, so the owner won't know how many pounds or how big the foal will be until it has been delivered.
In her uterus in the back half of her abdomen.
During the early stages of pregnancy, a foal is not yet visible, as it develops within the mare's uterus. As the pregnancy progresses, typically around the fifth month, the foal begins to take shape, with the growth of its limbs and body becoming more pronounced. By the seventh month, the foal is more recognizable, with defined features and movements. Near the end of the pregnancy, the foal is fully developed and ready for birth, usually weighing around 100-150 pounds at delivery.
When you start vaccinating a foal depends on the vaccination status of the dam during pregnancy and the diseases common to your area. Always contact your veterinarian to discuss vaccination programs that are appropriate for your horse's situation.
There really is no EXACT size, but they are usually about the size of a normal horse foal.
the size of a pinhead
During pregnancy, the abdomen (abdominal cavity) increases most in size as the uterus expands to accommodate the growing fetus. This expansion allows for the growth and development of the baby throughout the pregnancy.
No, some stay the same size during and after pregnancy.
The foal may be aborted or the pregnancy will continue with the foal suffering developmental problems from lack of nutrients.
Adema. Very similar to why humans legs swell up during pregnancy. It is nothing to worry about.
in my experience the foal is ussually the size of the sire but that does not mean the foal wont get as big as the dam
Some women will go back to pre pregnancy size and color, others stay larger but seldom as large as they were during pregnancy.