it means they will accept a land contract for the sale. It means that an offer has been accepted. You can still make a secondary offer on the home but it will not be presented to the seller until and unless the first contract falls through, at least in the US.
A premature birth is a birth that takes place more than three weeks before the baby is due. In other words, a premature birth is one that occurs before the start of the 37th week of pregnancy. Normally, a pregnancy usually lasts about 40 weeks. Premature birth gives the baby less time to develop in the womb. Premature babies, especially those born earliest, often have complicated medical problems.
In Australia, around eight per cent of babies are born prematurely (before 37 weeks gestation) every year. Most babies who are premature are born between 32 and 36 weeks gestation, and almost all of these babies grow up to be healthy children.