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.
A baby born before 33 weeks will have more serious problems such as immature lungs. Very premature babies (born under 28 weeks) need to be delivered in a hospital with a neonatal intensive care unit. Doctors have been able to improve dramatically the survival hopes for babies born as early as 22 or 23 weeks. However, very premature babies face a huge battle at the start of life.