important?

hi mummies. need some opinions/advices.. currently at 4months preggy and alr planning to get some stuffs for baby. may i know between steriliser milk warmer how is it important and how will it rlly benefit me? hahaha am a young mummy and my mother/sisters(in laws) doesnt have all those. should i get those bigger stuffs like playpen, stroller when baby is about 6months or i should just get them now? i am planning to buy about 20pcs of newborn clothes only since baby outgrow fast. thanks in advance!