Meghan Trainor has been given the “best advice” on balancing motherhood with her career from her celebrity friends. The 30-year-old pop star – who has Riley, three, and 10-month-old Barry with her husband Daryl Sabara – has not been on tour since 2016 but is preparing to hit the road again to promote her upcoming album ‘Timeless’ and is considering putting a crib onto her bus. She told Access Hollywood: “They’ve given me the best advice on how to bring my kids along. The best advice I got was, ‘Ask your bus driver if you can drill in the crib into the bus. There’s so many moms on there and I k…