Hi! So I'm a first time mom, which hopefully can justify the silliness of my question. My daughter is almost 3 months, though many of her 3 months pants are getting short and her onesies kind of snug. Does this mean she should already be moving to 6 month clothes? I know sizes are sometimes kind of weird, but that just sounds funny too, a not yet 3 month old wearing 6 month clothing. Thank you!