survey on correlation between unplan pregnancy and low birth weight in new infants

introduction weight in delivery is simplest and current health indication for assessment infant statues in each country.  purpose of this study is assessment correlation to unplan pregnancy and low birth weight in new infants also some key factors influencing on low birth weight. materials and methods in this study 838 pregnant mothers in two group wanted and unwanted performed. this study is descriptive and analytically based on cohort study. sample size was all mothers who refer to nine  health clinics in mashhad  province in 2012. questionnaire completed based on interview to mothers and observe health records. for analyzing data used chi-square and t-student  tests. results finding showed that in wanted group ( n=602) and unwanted (n=236) , 10.3 % of infants are lwb, in wanted group 11% and  unwanted group 8.5% reported however there was no significant relation between two groups. there was a significant relationship between two groups in  number of pregnancy and time of first reference to health clinic and duration between recent and previous visit (p=0.05). t-student test showed that thre is a signigicant relationship between the mean of mothers  age and  number of pregnancy in two groups(p=0.05) also chi square test showed that some factors like lodging of mother, mothers job, mothers education and her husband education had significant difference between two groups of wanted and unwanted pregnancy . some factors like unwanted pregnancy and hypertension, diabetes, smoking, separately had studied but the result showed that only drug abuse had a significant effect on lbw , however in mothers with drug abuse 40% and mothers without drugabuse 9.7% cause to lwb. conclusion considering the importance of birth weight in health of  infants and  advers  of unplanned pregnancy on it specialy in cases with high risk behaviours, pre-pregnancy caring and increase knowledge of mothersabout the importance of this cares are necessary.