proportional - one of the quantities in a mathematical proportion. quantity - the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable.
The third trimester is when women should eat around 500 extra calories per day. Special Considerations. While the 300 calorie per day example above is just an example, there are some special cases in which a woman might need to adjust her daily calorie intake to fit her needs.
Actually the third trimester begins at 28 weeks. It does not really matter what you call it. But I go with 27 weeks because in reality you are pregnant for 3 equal periods of 13 and a 1/3 weeks (or 13 weeks plus 2+ days). That math will give you 40 weeks. So really at 26 and 2/3 weeks (or 26 weeks and 4/5 days) you are 2/3 of the way done.