Laughing?

Ch
Anyone elses baby not laughing? She is 29 weeks...smiles constantly & she had a great temperament, but man is it hard to even get a slight chuckle out of her! She is not a serious baby either so im stumped! If i think im going to get a chuckle, i will literally throw myself into exhaustion trying to repeat whatever it is that "might" ever so slightly make her laugh, & then she stops 😖