Babbling

My daughter just turned 2 February and still babbles but she say basic stuff like hey,bye,stop,she sing to some music,count a few numbers, moma,dad when she want something she basically scream or cry 😑 but no full sentences at all . She understand what I be saying or telling her to do all the time I think I feel some way because my cousin her daughter just 1 month older then mines and she say full sentences ,talk back , know her colors , listen and understand everything , she call for her moma when something wrong literally like (ebony my finger is hurting) the list goes on the girl smart ! I know each child developed at its own pace but I’m like dang wish my child could at least do more by now I’m about to bring her twin brother and sister into the world soon anyone else child babbles still or what does your child do by now ? I just get sad