Hi Fee,

Just either expressed breastmilk (in your case) or an infant formula until 12 months. Follow on formula and toddler milk are not necessary. After that, cow's milk or similar is fine.

With regard to the formula companies advertising their product and the ethics of that ... well most advertising is aimed at getting people to buy something they usually don't really need. Is that ethical? Yes, so long as you know you are watching an advertisement. Advertising is unethical when it is presented as unbiased information and the presenter's vested interest is not openly declared.