Not speaking clear words or walking

My LO is 14 months and only taking 3-4 steps independently, he’s good and fast on his feet when using the walker or holding someone’s hand but refuses to take more than 5 steps when we let go. Also he still only babbles and speaks gibberish, we’re try to make him say “mama” or “dada” or literally anything and he’ll repeat sometimes the fluctuations of the words but not the sound or the word itself. He understands a lot and nods his head (lol he jiggles his whole body) to say yes, but otherwise he points to what he wants or babbles and only I understand him usually. Should I be concerned about either of these?? I’m worried he’ll be 15 months in 2 weeks still not speaking the basics and being carried around at nursery