naku mga sis here's some practical advice Lang. if di naman well-to-do ang guy na pwede magpamana ng limpak limpak na pera, lalo na if wala naman stable job, wag mo nalang ipa acknowledge. in my line of work I meet cases like these everyday, and almost always the father refuses to give support. so Kung kaya mo naman buhayin ang anak mo at di naman ganun kayaman ang guy, might as well not force him to acknowledge the baby. in case later on in life, you meet another guy who's willing to accept your baby, then it will be easier for you to adopt your kid after you get married. you won't need biological father's consent.
on the flipside, if biological daddy expresses eagerness to acknowledge, then go. your child also has the right to be acknowledged and to all the privileges and rights of an acknowledged child, although illegitimate. if biological father dies and leaves a hefty estate, may habol anak mo sa mana. hehe.