Do these hold carbonated drinks well? My current sippy spits out the carbonated drink constantly making a huge mess.

These do fine with carbonated drinks in my opinion

Are there replacement silicone straws for the top? My kids chewed holes through them.

Yes, like others said, click on replacement parts, there's a place holder for $4.86. When you select that, they ask for the number on the bottom of the cup, so they know which ones to give you. They sent me three for that price, free shipping. It was well worth it. My kid loves these cups, but also chews through them.

Brand	Zak Designs
Color	Campout
Special Feature	Soft Straw, Leak-Proof
Style	Drinkware
Theme	Travel
Recommended Uses For Product	Travel, Home
Included Components	Lid
Specific Uses For Product	Cold Drinks
Shape	Round
Product Care Instructions	Machine Wash, Hand Wash Only
Age Range (Description)	Kids 3+
Material Feature	Lightweight
Reusability	Reusable
Unit Count	1.0 Count
Product Dimensions	3.74"W x 6.89"H
Number of Items	1
Manufacturer	Zak Designs
UPC	707849142990
Size	15oz
Item model number	7071-U265
Material Type	Silicone, Plastic
Additional product features	Soft Straw, Leak-Proof
Batteries required	No

Kelso 15 oz Tumbler 2pc Set, (Campout) Leak-Proof Screw-On Lid with Straw Made of Durable Plastic and Silicone, Perfect Cup Bundle for Kids

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