Here's a general timeline:
* 6 months: They'll have reached about 70% of their adult size.
* 12-15 months: They'll be close to their full height and weight, but their coat may still be developing.
* 2-3 years: They'll be fully grown and mature, with a thick, fluffy coat.
It's important to note that these are just general guidelines. Individual Bichons may grow at slightly different rates. If you have any concerns about your Bichon's growth, be sure to consult with your veterinarian.