Transition sippy cups commonly range from about 7 ounces up to 10 ounces, with typical sizes at 7 oz, 8 oz, 9 fl oz, and 10 oz.
Most listings target babies and toddlers starting around 6 months and up; some cups are labeled for 12 months and older.
Transition sippy cups are made from a mix of materials, commonly plastic, silicone, stainless steel, and polypropylene (often used in combinations).
Spill-prevention features include one-way valve straw lids, weighted or flexible straws, flip or sliding travel lids that cover the straw, and automatic-seal or spoutless rims that close when not drinking.
Many cups include single or double handles, contoured or right-sized bodies, and removable side grips to make holding easier for small hands.
Wash the cup before first use. Remove any packing from weighted parts, then activate or seat valves per the product notes (for example, check valve seating or follow any roll/activation steps). Make sure lids are fully pushed down and seated before giving the cup to a child.
