1     exp Infant, Premature/ 
2     (prematur* adj2 infant*).tw. 
3     (prematur* adj2 newborn*).tw. 
4     (prematur* adj2 neonate*).tw. 
5     preterm.tw. )
6     low birth weight.tw. 
7     exp Infant, Low Birth Weight/ 
8     low birthweight.tw. 
9     VLBW.tw. 
10     LBW.tw. 
11     ELBW.tw. 
12     small for gestation*.tw. 
13     exp Infant, Small for Gestational Age/ 
14     SGA.tw. 
15     exp Infant, Very Low Birth Weight/ 
16     (less than adj6 g).tw.
17     exp Premature Birth/ 
18     (less than adj3 2kg).tw. 
19     (less than adj3 32 weeks).tw. 
20     birth weight below.tw. 
21     (gestation* adj2 less than).tw. 
22     or/1-21 
23     exp Breast Feeding/ or exp Infant Nutritional Physiological Phenomena/ 
24     dietary proteins/ or exp dietary supplements/ 
25     exp Fatty Acids, Omega-3/tu [Therapeutic Use] 
26     Arachidonic Acid/tu [Therapeutic Use] 
27     Fatty Acids, Unsaturated/tu [Therapeutic Use] 
28     Dietary Fats/ad, tu [Administration & Dosage, Therapeutic Use] 
29     enteral nutrition/ or parenteral nutrition/ 
30     exp Infant Formula/ or exp Milk, Human/ 
31     exp Food, Fortified/ 
32     exp food, formulated/ 
33     exp Infant Food/ 
34     (breast milk or human milk).tw. 
35     formula.tw. 
36     PUFA supplement*.tw. 
37     feed* regimen*.tw. 
38     (protein* adj2 concentration*).tw. 
39     probiotic$.tw. 
40     parenteral*.tw. 
41     enteral*.tw. 
42     maternal milk.tw. 
43     multinutrient supplement*.tw. 
44     (breast fed or breastfed).tw. 
45     prebiotic*.tw. 
46     diet* supplement*.tw. 
47     nutrient enriched.tw. 
48     Docosahexaenoic Acid*.tw. 
49     arachidonic acid*.tw. 
50     (glutamine adj2 supplement*).tw. 
51     (taurine adj2 supplement*).tw. 
52     (calcium adj2 supplement*).tw. 
53     palm olein.tw. 
54     palmitic.tw. 
55     palmitic acid.tw. 
56     (fortification or fortified).tw. 
57     fatty acids.tw. 
58     supplement* feed*.tw. 
59     complementary feed*.tw. 
60     nutrition*.tw. 
61     Hydrolysed liquid.tw. 
62     Hydrolyzed liquid.tw. 
63     gamma-linoleic acid.tw. 
64     (diet* adj3 protein*).tw. 
65     or/23-64 
66     randomized controlled trial.pt. 
67     controlled clinical trial.pt. 
68     randomized.ab. 
69     randomised.ab. 
70     placebo.tw. 
71     clinical trials as topic.sh. 
72     randomly.ab. 
73     trial.ti. 
74     (crossover or cross-over or cross over).tw. 
75     or/66-74 
76     22 and 65 and 75