It is a universal custom among Jews not to eat meat or poultry...

Nshei Chabad Newsletter / It is a universal custom among Jews not to eat meat or poultry, or drink wine, during the Nine Days. This refers even to food which was cooked with meat or has gravy. However, someone for whom dairy products are unhealthful who therefore needs to eat fleishigs may eat chicken. A sick person may eat meat as well, but if it isn't difficult, s/he shouldn't do so from the 7th of Av until after Tisha B'Av. Also, some nursing women avoid eating meat from the 7th of Av until after Tisha B'Av (Kitzur Shulchan Oruch, Ch. 122, Par. 8).