What Are The Risks Involved In Premature Labor Due To Decreased Baby Growth?

My wife is 32 weeks pregnant. A triple marker test was done during 20-24 weeks of pregnancy and AFP was reported to be high (2.7 MoM). Level II was conducted intensively and no defect was found in the baby. It was all right. Umbilical cord does have 3 vessels. Now, Level III was conducted for baby growth then it was informed that there is a lag in baby's growth by 2 week. Parameters are as follows: BPD: 79 mm, HC: 290 mm, AC: 264 mm; FL: 60 mm. Then doctor said that your baby growth is slow. This may be because of high AFP.Advised to go for Doppler scan. Conducted and found everything OK. It was also advised to take 12 mg Betneol injection twice with a gap of 24 hrs, Alamin M fort capsule twice a day and LArginine sachet once a day. She also said that we may have to deliver baby just after 34 week if no significant growth is seen in successive scans. Kindly advise for dose, premature labor..associated risk etc.