My friend gives her two year old son homeopathic medicines each time he has a fever, cough or cold. Are these medicines safe? Can I give it to my daughter as well?

By all means, take your child to a qualified homeopath for treatment. Homeopathics are extremely safe, cause no side effects and no iatrogenic diseases. Homeopathy is also very effective. Here are a few of the 100's of studies showing that: seasonal allergic rhinits (Ludtke & Wiesenauer, 1997, and Taylor et.al., 2000); upper respiratory tract infections and allergies (Bornhoft et.al., 2006), upper respiratory tract diseases including otitis media (Bellavite et. al., 2006). An 8-year-long German study showed significant improvement in children treated homeopathically for skin conditions and recurring upper and lower respiratory infections (Witt et.al., 2008).