<qa>  What is the name of the fatty acid methyl esters identified by comparison with retention timesThe mothers will be followed up in the hospital before discharge, at the postnatal clinic at 1 and 6 weeks, and at 3,6 and 12 months. The mothers blood 1 ml will be taken at 1 and 6 weeks and breast milk 20 mls will be collected at 1 week, 6 weeks, 3 months, 6 and 12 months after delivery as long as mothers breastfeeds.The maternal serum and breast milk total lipids will be extracted and fractionated using micro-extraction and semi-preparative liquid chromatography fraction methods. The fatty acid methyl esters will be separated, using liquid chromatography and capillary electrophoresis coupled mass spectrometry, and tje n-6 and n-3 fatty acid methyl esters identified by comparison with retention times and mass charge ratio information of pure reference substances sigma Aldrich Sweden AB,Stockholm, Sweden. 