When you’re 60 years old and have reflux, the doctor prescribes Nexium. When you’re 60 days old and have reflux, you puke.If trails of spit-up follow you wherever you go, keep things tidy with Petites Frites burp cloths and bibs.These wonders are more than just your average mess-catchers. Made from a blend of organic cotton and lyocell (a sustainable textile), the custom combo is highly absorbent and quick to dry. Plus, the double-sided knit, in primary colors and earth tones, feels plush to the touch — be it baby’s chin or your shoulder.Teether blankies are made from the same thirsty material and embellished with natural maple wood rings and hand-crocheted shapes for safe gnawing and excessive drooling.And that doesn’t bite.Available online at petitesfrites.com, $12-$84.Photo: Courtesy of Petites Frites EWWGrossology: the (Impolite) Science of the Human BodyWhat: Marvel at animatronic figures and get the facts on snot, burps, and more. Why: Barf? Boogers? Mr. Icky-Pants is in heaven. When: Sat.-Sept. 3. Mon.-Sat., 10 a.m.-5 p.m.; Sun., noon-5 p.m.Where: Fort Worth Museum of Science and History, 1600 Gendy St., Fort Worth (817-255-9300). Adults and teens, $10-$14; children, $10; under 2, free.PERUSEDFW Family ExpoWhat: Scale the rock wall, stop by the petting zoo, and treat yourself to a mini massage. Why: All ticket proceeds go to Children’s Medical Center. When: Sat., 10 a.m.-5 p.m.Where: Dallas Fair Park Centennial Hall, 1300 Robert B. Cullum Blvd. (214-670-8400). Info at 817-913-0558. Tickets online at dfwfamilyexpo.com. Adults and teens, $4; children 2-12, $3; under 2, free.GLOWCosmic ColorsWhat: The hue-filled film gives a crash course on the electromagnetic spectrum.Why: Simple enough for soon-to-be science buffs to grasp. When: Thru May 31. Tues., 6 p.m. & Sun., 1:30 p.m.Where: The Planetarium at University of Texas Arlington, Chemistry Physics bldg., 700 Planetarium Pl., Arlington (817-272-1183). Adults, $6; children, $4; under 3, free.