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At ordinary times, eustachian tube by extrusion and surrounding tissue in the export of nose pharynx ministry in closed state, but when the baby swallowing, chewing, sneezing, or crying, in order to maintain the balance of inside and outside the middle ear pressure, open eustachian tube is a moment. Because the baby's ear has not yet developed, eustachian tube is relatively short, low and flat, and position if you cross holding the baby, let him lie on your back with milk, milk bottle mouth open too large, bottles, vertical too straight, etc., are likely to cause the baby choking milk, and make the milk along the eustachian tube into the middle ear, induce otitis media.
Once you have your railroad theme, track shape and size in your mind it is a great idea to have a scale-sized track plan in front of you while you work. I have used both full-sized track plans from your CAD system and scale sized track plans. The full size track plans work great on substantial layouts, but I'm not sure these are really worth the pain of learning problematic laptop or computer to create smaller layouts. Scale sized track plans work all right, say 1 inch = 1 foot.
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