My son just turned 14 months today. Lately, he’s been refusing solids. He loves mandarin oranges but…

My son just turned 14 months today. Lately, he’s been refusing solids. He loves mandarin oranges but that’s about the only solid he’ll still eat. He drinks his whole milk regularly though. Should I be concerned? I don’t recall my 5 year old going to any of this when she was younger.