Some people move to solids before milk if LO is not taking enough solids. If I remember correctly Laura (who posted above) switched to breakfast solids first, milk later, because if milk was first LO wasn't interested in breakfast. But if the meals are being taken well then there is no need to change any of the timings.
Mine is 5yo and still has WU milk, breakfast, snack, lunch, snack, dinner and really the only change in timings is that once he started school there wasn't an hour between milk and breakfast, otherwise the times are basically the same as when he was a baby it's just that he has solid food rather than milk.