Yesterday I looked at three ASX shares brokers have given buy ratings to this week. Unfortunately, not all shares are in favour with them right now. Three ASX shares that have just been given sell ratings by brokers are listed below. Here’s why these brokers are bearish on them: According to a note out of Citi, its analysts have retained their sell rating and $6.05 price target on this infant formula company’s shares. Although the broker acknowledges that China’s new three-child policy will be a positive for the infant formula market, it doesn’t believe investors should get overly excited. This is because it believes the birth increases are likely to be occurring in lower tier cities. These are areas that Chinese infant formula producers generally have stronger market positions. The A2 Milk share price is fetching $6.93 on Thursday.