My 17 mth old just started walking. he tip toes sometimes when he walks. is that normal?

Im a typical 1st time mom who worries way too much about everything! doc said he doesnt have cerebral palsy so i stopped worrying about that. but the fact that he still tip toes freaks me out. he doesnt walk all the time but he is walking quite a bit and just started 3 days ago. my husband says its normal when they first start out. so sorry for seeming so silly. i just want to ask on here before i go to web md and find 3000 things that could be wrong! lol