Daughter is 2 year old and she used to achieve all the milestone. These days she doesn't respond to her name when we call but listens and be very attentive when we say things of her interest like TV,chocolate ,going out in car etc. Also she used to tell few rhymes n words which is not repeating now.Still now speaks mama,papa,few names ,shows body parts and few common words she says. Kind of worried ..is this regression? Her concentration towards learning is very less.She plays with us but still its ll has reduced