My DD at 1:30-4:30am wanted to play. She will be 7wks old tomorrow. I was making her smile and then she would cough once or twice and then would stop. Ever time I would get a big smile and then a cough again. Its not a constant cough only when i made her smile and not coughing this morning.

She hasnt started laughing or giggling yet. My question is -- could the cough be the start of learning to giggle? Did your child do this or did they just start laughing and giggling and at what age?