Now Playing: Ricin suspected at Pentagon mail center
Now Playing: Ricin scare hits Trump, the Pentagon
Now Playing: Envelope suspected of holding ricin addressed to Trump: Authorities
Now Playing: What is ricin?
Now Playing: Serena Williams recorded a version of ‘I Touch Myself’ for breast cancer awareness
Now Playing: What to know about the latest breakthroughs in breast cancer research
Now Playing: How to kick the junk food habit for good
Now Playing: 5 things celeb trainer Simone De La Rue does daily
Now Playing: Too much screen time, too little sleep linked to child development problems: Study
Now Playing: ‘GMA’ Hot List: Birth control linked to lower ovarian cancer risk
Now Playing: A speech therapy session with US’s youngest face transplant recipient
Now Playing: Newer hormonal birth control linked to lower ovarian cancer risk: Study
Now Playing: Newer hormonal birth control linked to lower ovarian cancer risk: Study
Now Playing: Gym for pregnant women gives moms a safe place to workout, build a community
Now Playing: Back pain myths you need to know about
Now Playing: When should you really get the flu shot?
Now Playing: 9-year-old in remission surprised by bone marrow donor who saved his life
Now Playing: Sara and Michael try out the HOT new health trend
Now Playing: Have you ever put on a little ‘love weight’?
Now Playing: My Morning Routine: 5 things boundary breaker Jessamyn Stanley does every morning