First of all, I think Sagittarius is very tall in the whole constellation. Generally speaking, 180 is his normal standard. Because generally speaking, the height of Sagittarius is the highest among girls in what constellation.
There is also a legend that Sagittarius is as tall as boys, which means that when Sagittarius girls and boys stand together, there is no pressure at all, which means Sagittarius girls are very tall, so I think Sagittarius girls are about 180, or more than 175. After all, I feel that Sagittarius girls are really tall in daily life. Some little sisters in life are Sagittarius. She is really tall. Every time her 170 height stands with their 180 height, it really seems insignificant. Even Sagittarius girls have the perspective of boyfriends.
Finally, I don't think we can judge height by any constellation. After all, I think height depends on the overall genetic aspects. A family's business situation is good, so his height may be higher. Of course, a family's genetic conditions are not good, so a Sagittarius girl may be shorter. I think the Sagittarius girl's 180 is just a general statement, and the most specific one varies from person to person. So I don't think babies under 175 should be too anxious, because everyone is different, and it is impossible to say that all Sagittarius girls are the same. Then there will be no difference between people in the world, so we should obey the genes given to us by our parents.