Photos: Courtesy of Little Hearts CPR You’ve learned your limits (only two glasses of wine at family dinners). But your sweet little petunia has yet to master his. Help him play it safe with these tips from Little Hearts CPR’s Amy Gross.Eyes on the prize. Choking is a silent — or near-silent — event, so watch him while he is eating.Size matters. Texture and shape do, too. Choose foods wisely and avoid slippery, hard, round, very dry, or very sticky foods. Hard candies, whole grapes, cheese cubes, raisins, and popcorn can be as hazardous as batteries, coins, and pen caps.Take a seat. Not only is it more civilized to sit still while eating, it’s also safer.Don’t play around. Toys with a diameter smaller than two inches (the size of a cardboard toilet paper roll) pose a choking risk for the under 3s.Taxi time. Always use a car seat in a cab. Period.Kitchen safety. Cook on back burners, turn pot handles in, and keep cords out of reach. Cleaning supplies should be kept up high and locked at all times.Take a breath. Attend a CPR class and learn to recognize and respond to a life-threatening event, be it choking, drowning, suffocation, or sudden respiratory arrest.Review and refresh your skills early and often. The stakes couldn’t be higher.To find more information on CPR classes, go to littleheartscpr.com.Photo: Courtesy of Little Hearts CPRPLAYOpenhousenewyork: Weekend Family Festival What: Hands-on art projects and ecodesign activities teach kids about architecture and sustainability.Why: It’s fun by design. When: Sat. & Sun., 11 a.m.-3 p.m.Where: Center for Architecture, 536 LaGuardia Pl., b/t W. 3rd & Bleecker Sts. R.S.V.P. at 212-358-6135 or to email@example.com.HEARAstrograss Country Bluegrass Brunch What: Check out this hilarious mix of folk music, fiddle hoedowns, and Shel Silverstein poetry made musical.Why: It’s fixin’ to be fun.When: Sun., 11 a.m.Where: 92YTribeca, 200 Hudson St., at Canal St. Tickets at 212-601-1000.SEEThe Adventures of Harold and the Purple CrayonWhat: Enchantment Theatre Company presents the tale of an imaginative boy and his art.Why: Play with color. When: Sun., 2 p.m.Where: Brooklyn Center for the Performing Arts, at Brooklyn College, 2900 Campus Rd., Brooklyn. Tickets at 718-951-4500 or online at brooklyncenteronline.org.