Aww, totally understandable to worry about this, especially first time! Honestly, growth varies so much from baby to baby, some of my mum friends' babies were on the smaller side at 3 months tapos biglang tumaas ng bilis around 4-6 months, so hindi necessarily delayed pa. But since height is something best tracked by your pedia, mas safe na i-mention mo sa next checkup para ma-assess nila properly based on your baby's overall health, genetics, at feeding, they'd know better kung normal lang development or may kailangan i-adjust. Hang in there, mommy, you're doing great monitoring!