It is not a right to be in someone else's home. It is a privilege. The laws also generally apply to public places, not private residences. You have the right to be in public places.
The bottom line:
a. Breastfeeding is recommended for a *minimum* of the first year of an infant's life, due to the risk factors that NOT breastfeeding introduces for both mothers and their infants.
2. Every major medical or health organization has issued some sort of statement to the above effect (and some have a *minimum* of two years, not one).
3. If a mother (whether she's known to be nursing or not) is invited into one's home, one should expect that said mother will need to feed her child while she's there. If you know she nurses, you should realize she may need to nurse her child while there. If you don't want that, don't invite her. Period.
4. Once she's there, to tell her she can't nurse is rude and ill-informed. The mother usually explains the reasons that bf is right for her/child, and in fact ALL infants. For a host(ess) to refuse is similar to a host(ess) refusing to allow a diabetic to check their blood insulin; or refusing to allow a 4 year old to use the bathroom.
5. Even the "Miss Manners" type books note that an infant under the age of 1 should be considered the same as the mother in terms of invitations to events etc.
The persons being rude are the host(esses) who are trying to forbid a mother from feeding her child. OR who expect the mother to go to great lengths to 'hide' a perfectly normal, healthy, and desirable situation (desirable as in "medically recommended"
To clarify for those who disagree -- I sincerely doubt that any of the posters who are arguing that mothers should be able to nurse anywhere they or their babies have a right to be, are arguing that to do so, one must remove all their clothing and do a lap dance on the hostess' lap. These situations usually go down with the bf mother trying desperately to explain her position and mend fences politely while holding her ground. While being told that she is disgusting, reprehensible, and possibly permanently damaging her child while offending everyone on the planet.