Jamie Lynn Grumet

TIME covermom Jamie Lynn Grumet put away her breasts for Mother's Day and hit up a park in Beverly Hills with her husband and two sons. Grumet made headlines last week when she appeared on the cover of the mag with her 3-year-old son ... who, let's say, was enjoying his lunch at the time. The…

The 3-year-old kid suckling from his mother's teet on the cover of Time Magazine is NOT too old to breastfeed ... so says a powerful breastfeeding organization -- but they do have one gripe. TMZ spoke with Bettina Forbes -- co-founder of Best for Babes -- an advocacy group dedicated to educating…