Getting baby to sleep longer... anyone?

Ashley
Okay my son is 13 weeks old and just turned 3 months old. He takes about 4 naps a day, 2 naps usually being 3 solid hours each. His last nap is after his evening bottle so he sleeps from 7-10:30 usually then we go to my room after his diaper is changed and has a bottle then 20 minutes later usually he is back to sleep until 5am. Has at bottle at 5am back to sleep after until 7am usually and sometimes until 8am then we start our day. How can I get him to sleep all night? I know it depends on baby, but what can be done or suggestions. Please let me know. Thanks ladies!!!