My baby girl is 2 months old today and I have noticed over the past week she is sucking the teat quite hard so it makes a kind of clicking noise when she's really hungry. She also sucks a few times said she's trying to get more milk before she swallows it. Does it sound like it's time to change the teat from slow flow to medium? The tommee tippee guideline says 3 months + but I know that is just a guideline. Do they sound like signs to look for? Thank you