Echolalia

My daughter was diagnosed with autism when she was 2.5. She is verbal but echolaic often. My worry is that my 18month old seems to be echolaic now too or is this "normal" for this age. He can finish songs, he can count to 10 (daughter LOVES numbers so heats this often) He points, responds to his name (most of the time), generaly good eye contact, calls or for us, asks to be picked up etc

we have done qchat and mchat and seem OK And Heath visitor thinks ok. Don't know what is "Normal" or not. Am very confused