Same way as human mothers
A foal copies it's mother.
Baby horses stay with there mother about nine months.
I belive that unicorns CAN have babies. I really think they are connected to horses, and horses have babies.
The stallion attacks the attacker while the mother takes her foal back into the safety of the herd.
They are like humans, they have babies when ever.
They are usually weaned at around 6 months, and then you start to separate the mother and her foal gradually.
Both llamas and alpacas only have one baby, also called a cria. They are like horses in which that 99.9% of the time they only have one baby, but in rare cases, like horses, they may have twins, but often one or both of the twins dies and possibly the mother. But I have seen here on the internet one set of twins where the mother and the babies all lived and the babies are growing up just fine.
horses can have babies whenever they go into labor, but it isn't always during the day or night
Sexually.
horses have babies just like humans, exept they're horses, of course
Horses can have there babies on land, but if the owner wants there horse to have a baby in a barn or somewhere they would keep it there until the horse has the babies (the owner will know round about what month the baby or babies are coming.)
They take care of their babies like horses do!