Learning to use a straw is a skill that takes practice, often requiring a few months of trial and error. To help, try offering fun, healthy liquids like tender coconut water to motivate them to suck. You can also teach them by giving them water from the end of a straw so they understand the sucking motion. Soft-spout cups can serve as a bridge before transitioning to a straw, but stay patient—many babies spend weeks just chewing on the cup before they finally figure out the suction.