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As for food regiments, women are advised not to eat "cold food" such as mung beans, bean sprout, banana or watermelon during the first trimester to reduce a risk of miscarriage.
And everything else I have found about watermelon and banana suggest the only reason you aren't allowed to eat it is because it is considered 'cold', which I think (what i have read) means it is watery and is meant to have a 'cooling' effect on the digestive system...... But then another site says that 'cold' food disrupts development of the babies skeletal system.... and then on another is says it will cause odema...
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Pineapple causes misacrriage (I have heard this though..?)
Talking about how beautiful a baby is may cause the gods to take the baby away.
Korean women may avoid certain foods because they are thought to cause the baby to have similar physical characteristics. These include some types of fish, crab, chicken, et
Mothers may be resistant to early breastfeeding, believing that colostrum is “bad milk.” For this reason, the mother may insist on bottle-feeding the infant until her real milk comes in. Should be provided with privacy while breastfeeding.
Tying a knot in the cord of the girl’s placenta will lead to the next child being a son.
Vietnamese parents are generally very permissive with children relating to the feeding practices, toileting and sex play. Mothers may masturbate male children during the first five years of life to assure optimal sexual performance during adult years. Female infants’ genitals may be fondled as a way of comforting a fussy infant.
Of course, I don't know how true these are... but an interesting read I suppose...