It could be lots of reasons. My ds has speech delay (moderate to severe) and the ped first though it was because of his ears. He had chronic ear infections and could not hear well because of them, but after 2 sets of tubes his speech really hadn't made much improvement. He had his adenoids removed also (nothing to do with speech) and that also had no effect on his speech. However speech therapy has helped him a ton
The only time you should look in your neighbor's bowl is to make sure that they have enough. You don't look in your neighbor's bowl to see if you have as much as them.