Most treatments for women with small babies are not really 'treatments' as such, but involve close monitoring, waiting and seeing and inducing (or delivering) the baby when tests indicate that the baby is not coping well. In cases of pregnancy complications, besides treating the complicating condition, this is probably all that can be done.
However, some treatments that may be used can include:
Low dose aspirin. In the past, daily low dose aspirin was prescribed in an effort to 'thin the blood' and theoretically allow more blood (carrying oxygen and nutrients) to get to the baby. The research on the effectiveness of this is inconclusive, and mainly showed benefits if the aspirin was started before the woman was 17 weeks pregnant. As small babies are unable to be detected before about 28 to 30 weeks, this is of little benefit to the woman but may be suggested for a subsequent pregnancy (although the same problem may not reoccur).
The aspirin can make the woman more prone to bleeding, as it alters the blood clotting of her blood, and should normally be stopped a week or so before the birth (if this is known), or if the woman experiences heavy bleeding in the pregnancy.
Bed rest. Admitting the woman to hospital, and keeping her on bed rest, has been a long tradition for the treatment of women with pregnancy complications (including small babies). Bed rest has been widely practised, without any scientific evidence of its benefit. Bed rest is expensive for the health system and can be stressful and uncomfortable for the woman, her partner and any children of the family. Research has failed to find any benefit for babies who are suspected of being Small for Gestational age. Conditions where there may be a case for bed rest include women with placental problems, due to bleeding. This would be to limit bleeding, rather than to improve the growth of the baby.
Energy and protein supplements.