Again, most likely not. Weighted straw cups were designed so that your baby or toddler can “drink from any angle” (presumably even while they are lying down) which is not necessarily the type of position we want to encourage consuming liquids anyway. Drinking from a more upright position is best, and as long as your toddler is holding a cup properly and there’s enough liquid inside, they should be able to drink from it, without needing a weighted straw inside. Another downside of these kinds of straw cups is that they can be difficult to clean thoroughly.