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.
The fetus is only about the size of beagle during pregnancy. The foal doubles in size during the last three months of pregnancy.
The size of a foal depends upon what breed the mother (and father) is and her nutritinal care prior to foaling. A miniture horse foal is way smaller than a draft horse foal!
A shire horse foal would be pretty much the same size as any other foal, accept for little ponies of course and miniatures
A foals height will depend on what breed it is. Most foals are about 10-12 hands high at birth and 90+ pounds.
two meters high
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.
With only one month to in the pregnancy you should look for movement of the foal and udder changes in size.
The pelvic cavity increases most in size during pregnancy
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.
the size of a pinhead
There really is no EXACT size, but they are usually about the size of a normal horse foal.
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.
Some women will go back to pre pregnancy size and color, others stay larger but seldom as large as they were during pregnancy.
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